FAQ

Most welding shops focus on MIG and stick welding for general fabrication. Specialization varies by equipment investment and welder certification-shops equipped for TIG welding handle aluminum and stainless steel, while those with flux-core capacity work outdoors or on thicker structural steel.

Aluminum and stainless steel require TIG welding equipment and specific filler materials that differ from mild steel welding. The amperage, shielding gas, and technique change significantly-aluminum needs AC current while stainless uses DC, and contamination affects stainless welds more than carbon steel.

Mobile welding serves projects that can't be moved-gates, trailers, structural repairs, and equipment breakdowns. Shop welding provides better conditions for precision work, cleaner welds, and access to specialized equipment. Transportation cost and project complexity determine which approach makes sense.

Custom fabrication costs more per piece but delivers exact dimensions and functionality that off-the-shelf products can't match. Volume matters-one custom piece costs significantly more than production items, but small runs of 10-50 units close the price gap when standard products require modification anyway.

MIG welding deposits metal faster with less spatter, making it ideal for clean sheet metal and automotive work. Stick welding penetrates deeper, works in windy outdoor conditions, and handles rusty or painted surfaces better-it's preferred for structural repairs, farm equipment, and trailer frames.

Cracks in trailer frames can be welded if the surrounding metal isn't corroded and stress concentrations are addressed. The repair involves grinding the crack to sound metal, welding with proper penetration, then reinforcing the area-effectiveness depends on crack location and whether load distribution caused the original failure.

Surface contaminants-rust, paint, oil, and mill scale-create porosity and weak welds. Preparation involves grinding to bare metal, degreasing with solvent, and removing oxide layers. Stainless steel requires stainless wire brushes to avoid contamination, and aluminum needs chemical cleaning because its oxide layer reforms within minutes.

Cracking happens when heat-induced stress exceeds metal strength during cooling. Thick sections, high-carbon steel, and rapid cooling create conditions for cracking. Preheating heavy materials, controlling cooling rates, and using proper filler metal selection prevent most cracking-some metals require post-weld heat treatment to relieve stress.

Matching existing work requires identifying the base metal composition, original welding process, and whether previous welds used correct technique. Old farm equipment and structural steel often contain unknown alloys that react differently to modern filler metals-test welds on inconspicuous areas reveal compatibility before committing to visible repairs.

Structural welding for buildings and bridges requires AWS D1.1 certification demonstrating specific joint preparation, inspection, and testing competency. General fabrication welding doesn't mandate certification, but certified welders produce more consistent penetration and understand metallurgy factors that affect long-term joint strength and fatigue resistance.