Welding Methods and Materials for Every Industry

Welding is a versatile process that's used in a wide range of industries, from construction to aerospace. There are many different welding methods and materials to choose from, each with its own unique advantages and applications.

Shielded Metal Arc Welding (SMAW) is a popular choice for heavy-duty welding, particularly in the construction and shipbuilding industries. It's known for its simplicity and portability, making it ideal for fieldwork.

Gas Metal Arc Welding (GMAW) is another common method, often used in the automotive and aerospace industries. It's known for its high-speed and high-quality welds, making it a favorite among manufacturers.

MIG welding is a type of GMAW that uses a continuous wire feed to create a strong and consistent weld. It's commonly used in the automotive industry for repairing and manufacturing car parts.

TIG welding, on the other hand, is a more precise and delicate process, often used in the aerospace industry for welding thin materials. It's known for its ability to produce high-quality welds with minimal distortion.

The history of welding dates back to ancient civilizations, with evidence of welding techniques found in the Indus Valley Civilization around 2800 BC.

In ancient Egypt, around 1500 BC, welders used a technique called fire welding, which involved heating and hammering metal pieces together to create a strong bond.

The ancient Greeks and Romans also used welding techniques, often for decorative purposes, such as creating intricate metalwork.

Welding wasn't widely used again until the Industrial Revolution in the 18th century, when new techniques and machines were developed to make the process faster and more efficient.

In the 19th century, the invention of the electric arc welder revolutionized the welding industry, making it possible to weld metals with greater precision and speed.

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Welding processes can be broadly categorized into two main types: heat-based and pressure-based. Heat-based processes, such as gas welding and arc welding, use heat to melt the base metals and filler metal, creating a weld pool.

Resistance welding, on the other hand, uses pressure and current to join overlapping metal sheets without filler material. This process is commonly used in the automotive industry and is known for its efficient energy use and limited workpiece deformation.

Some popular welding processes include Gas Metal Arc Welding (GMAW/MIG), Flux-Cored Arc Welding (FCAW), and Submerged Arc Welding (SAW), which are all known for their high welding speeds and portability.

Other welding processes include Solid-state welding, which uses pressure to join two pieces of metal, and Energy beam welding, which uses a highly focused laser beam or electron beam to melt metals and create welds.

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Lifetime Extension with After Treatment Methods is a game-changer for dynamically loaded, welded steel structures.

The welds, particularly the weld transitions, often determine the durability and life of these structures.

Grinding (abrasive cutting) is a selective treatment that can significantly increase the durability of many designs.

Shot peening is another method that can be used to treat weld transitions, leading to increased durability.

High-frequency impact treatment and Ultrasonic impact treatment are also effective methods for extending the lifetime of welded steel structures.

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Welding is a complex process that involves joining two or more pieces of metal together using heat, pressure, or both. There are several main processes used in welding, including solid-state welding, shielded metal arc welding, gas metal arc welding, and resistance welding.

Solid-state welding processes join two pieces of metal using pressure, without melting the metals. This includes electric resistance welding, which combines heat and pressure to join overlapping base metals without any filler material.

Shielded metal arc welding (SMAW) is a common process used among home-shop welders, involving manual techniques using a flux-coated electrode consumable. This process is not known for its high quality or durability, but it's one of the most low-cost processes.

Gas metal arc welding (GMAW/MIG) uses a thin wire as an electrode and is typically used in construction and automotive applications. This process requires a shielding gas like carbon dioxide, oxygen, argon, or helium to keep air containment out of the weld.

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Resistance welding generates heat from electrical resistance in the base metals, using two electrodes to press the metal sheets together and pass current through the sheets. This process is efficient and causes little pollution, but its applications are somewhat limited and the equipment cost can be high.

Here are some of the main welding processes:

Friction welding is a solid-state process that uses friction to fuse metals together, without using a welding torch, welding rods, or a shielding gas. This process is eco-friendly and produces minimal waste.

Tungsten inert gas welding (TIG) uses a non-consumable tungsten electrode and an inert shielding gas. This process creates accurate and high-quality welds with great penetration, making it suitable for applications like aerospace and automotive industries.

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Welding equipment plays a crucial role in the welding process.

Constant current power supplies are often used for manual welding processes, maintaining a relatively constant current even as the voltage varies. This is important because it helps to stabilize the arc length and heat input, making it easier to achieve consistent welds. Constant voltage power supplies, on the other hand, are used for automated welding processes, holding the voltage constant and varying the current to maintain a consistent arc length.

The type of current used in welding also affects the weld properties. Consumable electrode processes, such as shielded metal arc welding and gas metal arc welding, generally use direct current, but the electrode can be charged either positively or negatively, which impacts the weld penetration and welding speed.

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Gas welding, also known as oxyacetylene welding, is a versatile process that has been around for a long time. It uses an open flame to generate heat and shield the weld.

The equipment is relatively inexpensive and simple, consisting of a torch, hoses, pressure regulators, a tank of oxygen, and a tank of fuel. This makes it a great option for those on a budget or who need a reliable welding process.

A unique property of gas welding is that it doesn’t run on electricity, making it a viable choice if it isn’t available. This is especially useful for outdoor or remote welding projects.

The flame is less concentrated and lower in temperature than arc welding, about 3100 °C (5600 °F) near the torch tip. This causes slower weld cooling, which can lead to greater residual stresses and weld distortion.

Gas welding is widely used for welding pipes and tubes, as well as repair work. It's also a popular choice for heating metal before bending or straightening.

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The same equipment can be used for oxy-fuel cutting when adjusting the gas flow to manipulate the flame profile. This makes gas welding a great option for those who need to cut or weld metal.

Here are some common components of a gas welding setup:

Constant current power supplies are most often used for manual welding processes because they maintain a relatively constant current even as the voltage varies.

This is important because it helps to stabilize the arc, making it easier to control in manual welding processes like shielded metal arc welding and gas tungsten arc welding.

Constant voltage power supplies, on the other hand, hold the voltage constant and vary the current, making them suitable for automated welding processes.

These processes include gas metal arc welding, flux-cored arc welding, and submerged arc welding, where the arc length is kept constant.

Direct current is generally used in consumable electrode processes like shielded metal arc welding and gas metal arc welding, but the electrode can be charged either positively or negatively.

Changing the polarity of the electrode affects weld properties, with a positively charged anode resulting in a hotter base metal and deeper welds.

Non-consumable electrode processes, such as gas tungsten arc welding, can use either type of direct current or alternating current, which rapidly moves between positively and negatively charged electrodes.

You can view all your welding program photos and videos on the website, and they're organized by degree or certificate.

You can upload your own media to share with others, and the website allows you to view all your degrees and certificates.

To upload your media, simply click on the "Program Photos / Videos" link, and then select the type of media you want to upload.

Welding Safety is a top priority in any manufacturing process. All manufacturing processes come with some risks, and welding is no exception.

You need to have the proper knowledge and welding equipment to protect yourself from any hazards. Practicing safety precautions and using up-to-date protective gear is just as necessary.

Industry-leading six-axis robots are being used to improve welding safety, taking workers out of harm's way. These robots allow even the most complex welds to be executed without human interaction.

Flesh and blood specialists are still essential to the welding process, but they no longer need to get up close and personal with material or equipment.

You'll typically use a thin wire as an electrode in Gas Metal Arc Welding (GMAW/MIG), which is suitable for metals like copper, stainless steel, nickel, and more.

To keep air containment out of the weld, you must use a shielding gas like carbon dioxide, oxygen, argon, or helium during MIG welding.

These shielding gases help protect the weld from contamination, ensuring a strong and reliable bond.

Glass and plastic are commonly welded materials, but they have some unique properties that set them apart from metals. Unlike metals, which have a specific melting point, glasses and plastics have a melting range called the glass transition.

Glasses and plastics become softer and more pliable when heated past the glass-transition temperature (Tg), and they will become a very thick, sluggish, viscous liquid when heated above the glass-melting temperature (Tm). This viscous liquid has very little surface tension, becoming a sticky, taffy to honey-like consistency.

The two liquids will generally mix and join at first contact when pressed together, and upon cooling through the glass transition, the welded piece will solidify as one solid piece of amorphous material.

Some thermoplastics, like polyethylene, polypropylene, polystyrene, polyvinylchloride (PVC), and fluoroplastics like Teflon and Spectralon, can also be welded using heat. These plastics form long molecular chains, which are often coiled or intertwined, forming an amorphous structure without any long-range, crystalline order.

Thermoplastics have a glass transition above which welding can occur, but semicrystallines also have a specific melting point which is above the glass transition. Above this melting point, the viscous liquid will become a free-flowing liquid.

To weld thermoplastics, they must first be cleaned and then heated through the glass transition, turning the weld-interface into a thick, viscous liquid. Two heated interfaces can then be pressed together, allowing the molecules to mix through intermolecular diffusion, joining them as one.

A filler rod may often be used for certain types of joints, and the main differences between welding glass and plastic are the types of heating methods, the much lower melting temperatures, and the fact that plastics will burn if overheated.

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Metal is a broad category, but in the context of welding, it's essential to know the types of metals you can work with. Copper, stainless steel, and nickel are all popular choices for welding.

These metals can be welded using Gas Metal Arc Welding (GMAW/MIG), a process that uses a thin wire electrode. You'll need to use a shielding gas like carbon dioxide, oxygen, argon, or helium to prevent air containment in the weld.

The GMAW/MIG process is commonly used in construction and automotive applications, where these metals are often used.

There are several types of welds, each with its own unique characteristics. A partial penetration weld, also known as partial joint penetration (PJP), occurs when the weld metal is intentionally not fully penetrating.

A partial penetration weld can be used in various applications, including slot and plug welds. A slot weld, for instance, is a joint between two overlapping parts created by depositing a filet weld around the edge of a hole in one part.

Some common types of welds include butt joints, T joints, corner joints, edge joints, cruciform joints, and lap joints. These joints can be used in a variety of projects, from manufacturing tin cans to radiators.

Here's a quick rundown of some common weld types:

Full penetration welds, also known as complete joint penetration (CJP), occur when the weld metal fully penetrates the joint with complete root fusion. Plug welds, on the other hand, use a filler metal to join one part to the surface of another overlapping part through the hole.

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Resistance welding is a popular method that generates heat from electrical resistance in the base metals, and it's used extensively in the automotive industry to join overlapping metal sheets of up to 3 mm thick.

Resistance spot welding is a type of resistance welding that's used to join metal sheets, and it's known for its efficient energy use and high production rates. It's also easy to automate and doesn't require any filler materials.

Seam welding is another type of resistance welding that relies on two wheel-shaped electrodes to apply pressure and current to join metal sheets, making it possible to make long continuous welds.

Shielded metal arc welding, also known as stick welding, is a common process used among home-shop welders that involves manual techniques using a flux-coated electrode consumable. It's one of the most low-cost processes, but it's not known for its high quality or durability.

There are several types of welds, each with its own unique characteristics and uses. A partial penetration weld, also known as a partial joint penetration (PJP) weld, occurs when the weld metal is intentionally not fully penetrating.

Let's take a look at some of the most common types of welds. A slot weld is a joint between two overlapping parts, created by depositing a filet weld around the edge of a hole in one part that's joined to the second part through the exposed surface of the hole.

Seam welding is a subcategory of spot welding that uses two electrode wheels to apply pressure while current is applied through the workpiece. This process creates tight joints and is incredibly fast and clean, making it an ideal choice for automated welding.

There's also the full penetration weld, also known as complete joint penetration (CJP), where the weld metal fully penetrates the joint with complete root fusion. This type of weld is often used in applications where high strength and reliability are required.

Plug welds are another type of weld, where a filler metal is used to join one part to the surface of another overlapping part through the hole. This type of weld is commonly used in the manufacture of tin cans, radiators, and steel drums.

Here are some common joint configurations, which can help you identify the type of weld used in a particular application:

Spot welding is a fast and efficient method that uses a welding current to fuse metals together in a matter of milliseconds.

The process involves using two electrodes to press together overlapping metals, generating heat that creates a weld joint in the shape of a button or nugget.

Spot welding is typically automated by welding robots, making it a popular choice for industries like automotive, electronics, and manufacturing.

This method is known for its minimal heat-affected zone, leaving the surrounding area unharmed by excessive heat.

Metals can be fused together in as little as 10-100 milliseconds, joining workpieces almost instantaneously.

Resistance welding is a popular method used to join metal sheets, including those up to 3 mm thick, with high production rates and easy automation.

The process involves using two electrodes to press the metal sheets together and pass current through them, generating heat from electrical resistance in the base metals.

High current (1,000–100,000 A) is passed through the sheets, causing small pools of molten metal to form at the weld area.

Resistance spot welding is a variation of this method, used extensively in the automotive industry, where industrial robots can make several thousand spot welds.

Seam welding relies on two electrodes to apply pressure and current to join metal sheets, but instead of pointed electrodes, wheel-shaped electrodes roll along and often feed the workpiece.

This process makes it possible to make long continuous welds, but its uses are now more limited than in the past.

You can earn a certificate from the American Welding Society Entry-Level Welder Training Program by completing coursework requirements and passing written and performance exams. A nominal fee is required.

SVC is also an approved test lab for the Washington Association of Building Officials (WABO) welder certification program, offering students the opportunity to earn this important industry credential for a nominal fee.

To become a qualified welder, consider attending a skilled trade training program that provides practical experience and hands-on training, such as EIT's one-year welding program.

Certifications are a crucial part of a welder's career, and there are several organizations that offer certification programs. SVC's Welding program is an approved participant in the American Welding Society Entry-Level Welder Training Program, which requires students to complete coursework and pass written and performance exams to earn a certificate.

Students who complete the program can earn a certificate from the AWS, a nominal fee is required. SVC is also an approved test lab for the Washington Association of Building Officials (WABO) welder certification program. Students completing certification or degree programs will have the opportunity to earn this important industry credential, also with a nominal fee.

The WABO certification program is a great way for experienced welders to gain competence in all major welding theory, processes, and certification test procedures. Special coursework is available to prepare students for this test, giving them the experience and competence they need to succeed.

Here are some key facts about certifications:

The WABO Certificate Test Location is now available at Clark College for students, recent graduates, and welding professionals in the community.

Students can take the test at a reduced rate of $230, but this offer is only available to students currently enrolled in the program and recent graduates.

Non-student welders are ineligible for student pricing, so it's essential to check your eligibility before signing up for the test.

The WABO certificate is a requirement for welding professionals doing code work in Washington State, so it's a must-have for those looking to work in the industry.

The American Institute of Steel Construction's Steel Days High School Competition is a great way for students to showcase their welding skills.

This competition is a high school welding competition, as mentioned in the competition flyer.

The competition flyer is available for review to learn more about the event and how to support it.

Welding is a career with a wide range of opportunities in various industries, including aerospace, construction, and automotive. You can expect to find employment opportunities in these fields.

The U.S. Department of Labor forecasts welding jobs to grow at a rate of 4 percent. This means there will be a steady demand for skilled welders in the job market.

Experienced welders and fabricators can earn a median salary of $45,000 to $60,000 per year. This is a competitive wage for a career that requires hands-on skills and attention to detail.

The American Welding Society (AWS) estimates that the industry will face a massive 400,000 worker shortage by 2024. This shortage is likely due to a large portion of the industry retiring.

As a result, there are more opportunities than ever for people to start a new career or switch careers to welding.

The cost of welding plays a crucial role in manufacturing decisions. Many different variables affect the total cost, including equipment cost, labor cost, material cost, and energy cost.

Equipment cost can vary greatly depending on the process, from inexpensive methods like shielded metal arc welding to extremely expensive methods like laser beam welding and electron beam welding.

Labor costs generally make up the vast majority of the total cost for manual welding methods. This is because labor costs depend on the deposition rate, hourly wage, and total operation time.

To minimize labor costs, welding procedures with high deposition rates can be selected, and weld parameters can be fine-tuned to increase welding speed. This can help reduce operation time and lower costs.

Mechanization and automation are often implemented to reduce labor costs, but this frequently increases the cost of equipment and creates additional setup time. Material costs tend to increase when special properties are necessary.

In recent years, industrial welding has become increasingly more automated, most notably with the use of robots in resistance spot welding and in arc welding. This is especially true in the automotive industry, where robots are widely used.