Various Welding Procedures and When to Use Each One
Choosing the wrong welding process can turn a simple job into a slow, expensive mess. The weld may be too weak, the metal may warp, or the finish may need hours of grinding. The right process makes the work safer, cleaner, faster, and better suited to the metal in front of you.
Welding is not a single skill or one machine setting. It is a family of processes that use heat, pressure, filler metal, shielding gas, flux, or some mix of those to join materials. A small stainless steel bracket, a farm gate, a truck frame, and a pressure vessel all call for different choices.
This guide breaks down the most common welding procedures, what each one does well, where it struggles, and when it makes the most sense.
Start with the job before choosing the process
A good weld starts before the arc. The process should match the metal, thickness, joint design, location, appearance needs, and production speed.
The main questions are simple:
What metal is being welded?
How thick is the material?
Is the work indoors, outdoors, or in the field?
Does the weld need to look clean?
Is speed more important than precision?
Will the part carry load, pressure, heat, or vibration?
Can the metal be cleaned well before welding?
For example, MIG welding often works well for mild steel in a shop because it is fast and easy to learn. TIG welding is better when the weld must be precise and attractive, such as on stainless steel tubing or aluminum parts. Stick welding is often the practical choice for outdoor repair work because wind does not affect it as much as gas-shielded processes.
The rest of the decision comes down to knowing what each process is built to do.
Shielded metal arc welding is tough and field friendly
Shielded metal arc welding, often called stick welding or SMAW, uses a flux-coated electrode. The electrode creates the arc, adds filler metal, and forms shielding gas and slag as the flux burns.
Stick welding is one of the most widely used procedures because the equipment is simple, portable, and rugged. It works well on carbon steel, stainless steel, cast iron with the right rod, and some high-strength steels when proper procedures are followed.
It is especially useful for:
Structural steel
Farm and equipment repair
Outdoor welding
Maintenance work
Heavy plate
Rusty or less-than-perfect surfaces
Stick welding handles wind better than MIG or TIG because it does not rely on an external shielding gas bottle. That makes it a smart choice on construction sites, pipelines, railings, gates, and repair jobs where conditions are not ideal.
The tradeoff is cleanup and speed. Stick welding leaves slag that must be chipped or brushed off. It also requires more skill than MIG to maintain arc length, angle, and travel speed. Thin sheet metal can be difficult because the process can burn through quickly.
Use stick welding when the work is heavy, outdoors, dirty, or remote, and when portability matters more than a polished appearance.
Gas metal arc welding is fast and easy to learn
Gas metal arc welding, better known as MIG welding or GMAW, uses a continuously fed wire electrode and shielding gas. The wire acts as both the electrode and filler metal.
MIG is popular in fabrication shops because it is fast, productive, and easier to learn than stick or TIG. Once the machine is set for wire speed and voltage, the operator can make consistent welds with a smooth arc and little slag. It is common for mild steel, stainless steel, and aluminum with the right wire, gas, and setup.
MIG welding is a strong fit for:
Sheet metal
Auto body work
Light to medium fabrication
Shop-built frames
Gates, brackets, and furniture
Production welding
The process works best on clean metal and in controlled indoor conditions. Wind can blow away shielding gas, which leads to porosity and weak welds. For outdoor work, welders often switch to flux-cored wire or stick welding.
MIG also allows several transfer modes, including short-circuit, spray, and pulsed spray. Short-circuit transfer is common for thinner material. Spray transfer can be faster and smoother on thicker steel, but it usually needs higher heat and the right gas mix.
Use MIG welding when speed, repeatability, and ease of use matter, especially in a shop with clean material and good fit-up.
Gas tungsten arc welding gives the most control
Gas tungsten arc welding, commonly called TIG welding or GTAW, uses a non-consumable tungsten electrode to create the arc. Filler rod can be added by hand, or the weld can be made without filler if the joint allows it. Argon or another shielding gas protects the weld.
TIG welding is known for precision. It gives the welder excellent control over heat and filler metal. The result can be a clean, neat, high-quality weld with little spatter and no slag.
TIG is often used for:
Stainless steel
Aluminum
Chromoly tubing
Thin material
Food-grade and sanitary pipe
Aerospace and motorsport parts
Visible welds where appearance matters
The process shines when heat control is critical. Thin stainless, for example, can discolor or warp if overheated. TIG allows a skilled welder to manage the puddle carefully. On aluminum, alternating current TIG helps break up the oxide layer while welding.
The downside is speed. TIG is slower than MIG and usually takes more practice. It also requires clean metal. Oil, paint, rust, or poor gas coverage can cause contamination. In many cases, the joint needs careful preparation before welding starts.
Use TIG welding when the weld must be clean, precise, attractive, or made on thin and sensitive materials.
Flux-cored arc welding is built for heavy work
Flux-cored arc welding, or FCAW, looks similar to MIG because it uses a continuously fed wire. The difference is the wire has flux inside. Some flux-cored wires are self-shielded and do not need external gas. Others are gas-shielded and used for higher-quality shop or structural work.
FCAW is known for high deposition rates, which means it can put down a lot of weld metal quickly. That makes it useful on thicker steel and production work where speed matters.
Flux-cored welding is common for:
Heavy equipment
Structural steel
Shipbuilding
Outdoor fabrication
Thick plate
Repairs where MIG gas shielding is impractical
Self-shielded flux-cored wire is useful outside because it handles wind better than standard MIG. Gas-shielded flux-cored wire can make strong, productive welds in shop conditions, especially on heavier sections.
The drawbacks include smoke, spatter, slag, and cleanup. Flux-cored welding also requires the right wire for the job. Some wires are designed for single-pass work, while others are made for multi-pass structural welds.
Use flux-cored welding when working on thick steel, outdoor projects, or jobs that need faster weld metal buildup than stick welding can provide.
Submerged arc welding is made for long, heavy seams
Submerged arc welding, or SAW, is a high-productivity process used mostly in industrial settings. It uses a continuously fed wire electrode and a blanket of granular flux. The arc burns under the flux, which shields the weld and reduces spatter and arc glare.
This is not a handheld repair process. It is usually mechanized or automated. SAW works best for long, straight, heavy welds where the setup time pays off.
Common uses include:
Pressure vessels
Large pipe
Tanks
Beams
Heavy plate fabrication
Ship and bridge components
Submerged arc welding can produce deep penetration and high-quality welds at high speed. It is especially useful for thick steel sections and repetitive seams.
The limits are position and access. SAW is usually used in flat or horizontal positions. It is not practical for small, complex parts or tight spaces. The equipment also takes more setup than stick, MIG, or TIG.
Use submerged arc welding when the project involves long seams, thick steel, and repeatable industrial fabrication.
Resistance welding joins sheet metal without filler
Resistance welding uses electrical resistance and pressure to join metal. The most familiar version is spot welding, where two copper electrodes clamp sheets together and pass current through the joint. The metal heats at the contact point and forms a weld nugget.
This process is common in high-volume manufacturing, especially for sheet metal assemblies. It does not use filler metal, shielding gas, or flux.
Resistance welding is often used for:
Automotive body panels
Metal cabinets
Appliance parts
Sheet metal brackets
Wire mesh
Battery tabs in specialized applications
Spot welding is fast and repeatable. Machines can make many welds in the same pattern with consistent pressure and current. Since the weld is localized, distortion can be lower than with slower arc welding processes.
The limitation is joint style. Resistance welding works best when overlapping sheets can be clamped between electrodes. It is not useful for most thick plate, open butt joints, or field repairs.
Use resistance welding when joining overlapping sheet metal in a production setting where speed and consistency count.
Oxy-fuel welding and cutting still have a place
Oxy-fuel welding uses a flame from oxygen and fuel gas, commonly acetylene, to melt the base metal and filler rod. It was once a main welding method, but arc welding has replaced it for many jobs. Still, oxy-fuel equipment remains useful.
It is commonly used for:
Cutting steel
Heating and bending metal
Brazing
Soldering
Light repair work
Working where electrical power is not available
Oxy-acetylene welding can join thin steel, but it is slower and puts more heat into the surrounding metal than many arc processes. That can cause distortion. For many modern fabrication jobs, MIG or TIG gives better control and speed.
The cutting side is different. Oxy-fuel cutting remains practical for carbon steel because the oxygen jet reacts with hot steel and blows away oxide. It does not cut stainless steel or aluminum the same way because those metals form oxides that behave differently.
Use oxy-fuel when cutting, heating, bending, brazing, or doing simple repair work where portability and flame control are useful.
Plasma arc, laser, and electron beam welding serve specialized needs
Some welding procedures are less common in small shops but very important in advanced manufacturing.
Plasma arc welding is related to TIG, but it constricts the arc through a fine nozzle. This creates a focused heat source. It can be used for precision work and automated welding, especially where consistent penetration matters.
Laser beam welding uses a focused laser to create a narrow, deep weld. It is fast and precise, often used in automated production. It works well for small parts, sealed components, and applications that need low distortion.
Electron beam welding uses a high-velocity beam of electrons, usually in a vacuum chamber. It can produce deep, narrow welds with low distortion. It is used in aerospace, power generation, medical devices, and other high-spec industries.
These methods offer precision, speed, and control, but the equipment is costly and not practical for general repair or everyday fabrication.
Use these processes when the part demands high precision, tight quality control, automation, or very low distortion, and when the equipment cost makes sense.
A quick comparison of common welding procedures
The table below gives a practical snapshot of where each process fits best.
Welding procedure | Best used for | Main strengths | Main limits |
Stick welding | Outdoor repair, structural steel, heavy work | Portable, rugged, works in wind | Slag cleanup, harder on thin metal |
MIG welding | Shop fabrication, mild steel, sheet metal | Fast, easy to learn, clean process | Poor in wind, needs clean metal |
TIG welding | Stainless, aluminum, thin parts, visible welds | Precise, clean, attractive welds | Slow, requires skill and clean prep |
Flux-cored welding | Thick steel, outdoor fabrication, heavy repair | High weld deposit, good field use | Smoke, spatter, slag |
Submerged arc welding | Long seams, heavy plate, industrial work | Very productive, deep penetration | Limited positions, high setup effort |
Resistance spot welding | Sheet metal production | Fast, repeatable, no filler | Limited to overlapping joints |
Oxy-fuel | Cutting, heating, brazing, simple repairs | Portable, useful without electricity | Slow for welding, more distortion |
Laser or electron beam | Precision production, specialized parts | Fast, narrow welds, low distortion | Expensive, specialized equipment |
Match the process to the material
Material choice often narrows the field quickly.
Carbon steel is the most forgiving. Stick, MIG, flux-cored, submerged arc, TIG, resistance welding, and oxy-fuel can all work depending on thickness and job type.
Stainless steel needs good shielding and heat control to avoid contamination and loss of corrosion resistance. TIG is common for clean, critical work. MIG and flux-cored processes can also work well in production.
Aluminum conducts heat quickly and has an oxide layer that melts at a much higher temperature than the base metal. TIG is common for precision aluminum work. MIG can be faster on thicker aluminum with the correct wire feed setup, often using a spool gun or push-pull system.
Cast iron is tricky because it cracks easily if heated or cooled too quickly. Stick welding with the right nickel-based electrode is common for repairs, but preheating and slow cooling often matter as much as the welding process.
Galvanized steel requires extra care because welding zinc-coated metal creates hazardous fumes. The coating near the weld area should be removed when possible, and proper ventilation and respiratory protection are critical.
Safety and procedure matter as much as process choice
Even the best welding process fails if the setup is unsafe or the procedure is wrong. Welding creates intense light, heat, fumes, sparks, and electrical hazards.
Basic safety practices include:
Wear a proper welding helmet with the correct shade.
Use gloves, flame-resistant clothing, and eye protection.
Keep flammable materials away from the work area.
Ventilate the space, especially when welding coated or stainless materials.
Clamp the work securely before striking an arc.
Follow the machine settings and electrode or wire recommendations.
Inspect welds for cracks, porosity, undercut, and lack of fusion.
For structural, pressure, transportation, or code-related work, welding should follow a qualified welding procedure specification, often called a WPS. Those jobs may also require certified welders and inspection.
A home repair weld and a load-bearing structural weld are not the same type of decision. When failure could injure someone or cause major damage, use qualified help.
The best welding procedure is the one that fits the whole job
There is no single best welding method. Stick is hard to beat for outdoor repairs. MIG is a workhorse for fast shop fabrication. TIG is the choice for clean, precise welds. Flux-cored welding handles heavy jobs with speed. Submerged arc welding belongs on long industrial seams. Resistance welding rules high-volume sheet metal. Oxy-fuel remains valuable for cutting, heating, and brazing. Laser and electron beam welding serve specialized precision work.
The smartest choice comes from matching the procedure to the metal, thickness, location, finish, strength needs, and budget. Start with those basics, then choose the process that gives the safest weld with the least wasted time.
Comments