Whether you are looking at a towering structural steel framework, custom architectural railings, or heavy industrial machinery, welding is the backbone of modern construction and metal fabrication. Joining two pieces of metal sounds simple on the surface, but achieving a clean, structurally sound, and durable weld requires choosing the exact right process for the job.
At Washington Iron Works, precision craftsmanship and structural integrity are at the heart of everything we build. Different metals, material thicknesses, and project environments demand different welding techniques.
Here is a guide to the most common types of welding, how they work, and where each process shines best.
1. MIG Welding (GMAW – Gas Metal Arc Welding)
Often considered the workhorse of modern fabrication, MIG welding uses a continuous solid wire electrode fed through a welding gun, paired with a shielding gas (usually an argon and carbon dioxide mix) to protect the weld puddle from atmospheric contamination.
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Best For: Structural steel, sheet metal, aluminum, and general metal fabrication.
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Key Advantages: High speed, efficiency, and versatility. Because the wire feeds continuously, MIG welding allows technicians to complete long, clean welds quickly with minimal cleanup.
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Typical Applications: Building frames, custom gates, railings, automotive repairs, and manufacturing.
2. TIG Welding (GTAW – Gas Tungsten Arc Welding)
When absolute precision, strength, and flawless aesthetic appearance matter most, TIG welding is the gold standard. TIG uses a non-consumable tungsten electrode to deliver the arc, while the welder manually feeds a separate filler rod into the weld pool with their other hand.
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Best For: Thin materials, non-ferrous metals like aluminum, stainless steel, copper, and decorative architectural ironwork.
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Key Advantages: Exceptional control over heat and weld appearance. TIG produces extremely clean, high-integrity welds without spatter or slag.
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Typical Applications: Custom architectural metalwork, decorative iron fencing, high-pressure piping, aerospace components, and precise structural joints.
3. Stick Welding (SMAW – Shielded Metal Arc Welding)
The most traditional and rugged method, Stick welding uses a consumable electrode stick coated in flux. As the weld is made, the flux coating burns, creating a protective gas shield and layer of slag over the weld bead.
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Best For: Heavy structural steel, outdoor construction, rusted or dirty metals, and thick materials.
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Key Advantages: Portability and extreme durability under adverse conditions. Stick welding does not rely on external shielding gas tanks, making it ideal for windy outdoor jobsites.
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Typical Applications: Heavy equipment repair, bridge construction, structural steel erection, pipeline welding, and outdoor ironwork installations.
4. Flux-Cored Arc Welding (FCAW)
Similar to MIG welding, Flux-Cored Arc Welding uses a continuously fed wire electrode. However, instead of a solid wire, FCAW uses a hollow wire filled with flux. It can be performed with or without external shielding gas (self-shielded).
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Best For: Heavy industrial fabrication, thick structural plates, and high-wind outdoor work.
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Key Advantages: High deposition rates and deep joint penetration. It combines the continuous feed speed of MIG with the outdoor durability of Stick welding.
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Typical Applications: Heavy structural construction, equipment repair, ship building, and heavy plate fabrication.
Choosing the Right Weld for Your Project
Selecting the proper welding method comes down to a few critical factors:
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Material Type & Thickness: Thinner stainless steel or aluminum calls for TIG precision, while thick structural I-beams require the penetration of Stick or Flux-Cored processes.
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Environment: Indoor shop fabrication allows for shielded gas processes (MIG/TIG), while field installation often demands weather-resistant techniques.
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Aesthetic Requirements: Visible architectural features benefit from polished TIG seams, while hidden structural joints prioritize raw strength.
Quality Ironwork & Fabrication You Can Trust
From heavy structural steel fabrication to intricate custom ironwork, proper welding technique is what guarantees safety, beauty, and longevity. At Washington Iron Works, our experienced team brings the right tools, technique, and expertise to every project—ensuring every weld meets the highest standards of strength and craftsmanship.
Planning a structural or custom metal project?
Visit washingtonironworks.com today to explore our services or get in touch with our fabrication team to discuss your project needs!