Welding Procedure and Material Compatibility Report

What a good one includes

• A detailed identification of the base metals being joined, including their specific grades, chemical compositions, and thickness ranges.
• Clear specifications for the correct filler metal classification, wire diameters, and matching shielding gas compositions.
• Precise thermal management parameters, including minimum preheat temperatures, maximum interpass temperatures, and any required post-weld heat treatment cycles.
• A clear joint design schematic showing the groove angles, root openings, and weld pass sequence.
• Actionable electrical guidelines detailing the recommended welding current, polarity, voltage ranges, and travel speeds for each pass.
• A list of recommended non-destructive testing methods to verify the integrity of the completed joint.

Common mistakes to avoid

• Relying on generic welding procedures without adjusting for the specific grades and thicknesses of the actual production materials.
• Failing to account for the unique thermal expansion rates of dissimilar metals, which leads to severe warping or hot cracking.
• Ignoring preheat requirements on high-carbon or alloy steels, which almost guarantees hydrogen-induced cracking in the heat-affected zone.
• Neglecting to specify the exact shielding gas flow rate and purity, resulting in porosity and weak, oxidized welds.

Frequently asked questions