What practice specifically minimizes warping when welding stainless steel?

• A. Use compatible filler metal.
• B. Clean base metal to avoid contamination.
• C. Minimize carbon pickup to prevent sensitization.
• D. Avoid excessive heat input to reduce warping.

Answer: (D)

Warping from welding stainless steel happens when heat you apply isn’t controlled, causing the metal to expand and then pull as it cools. The most reliable way to minimize distortion is to avoid excessive heat input. That means using appropriate welding parameters (lower current and voltage, faster travel speed), and using techniques that spread the heat more evenly or interrupt it, such as stitch or back-step welding, or adding heat sinks and proper clamps to dissipate heat. While keeping the filler metal compatible, keeping the base metal clean, and avoiding carbon pickup are important for weld quality and corrosion resistance, they don’t directly prevent warp caused by high heat input.