Which practice helps minimize distortion during multi-pass welding?

Which practice helps minimize distortion during multi-pass welding?

• A. Use larger electrode
• B. Control interpass temperature
• C. Slower travel speed
• D. Increase heat input

Answer: (B)

When welding in multiple passes, distortion comes from heat going in and out of the metal, creating uneven expansion and contraction. Controlling interpass temperature keeps the metal within a set temperature range between passes, so each new pass isn’t adding excessive heat. That limits thermal gradients and the resulting shrinkage and warping, helping the joint stay straighter as it cools. If interpass temperatures run high, the next pass adds more heat on top of already heated metal, increasing distortion. Keeping the interpass temperature within recommended limits minimizes this buildup and yields more predictable, tighter results. Choices that raise heat input—like using a larger electrode, slower travel speed, or overall higher heat input—tend to promote distortion rather than reduce it.

When welding in multiple passes, distortion comes from heat going in and out of the metal, creating uneven expansion and contraction. Controlling interpass temperature keeps the metal within a set temperature range between passes, so each new pass isn’t adding excessive heat. That limits thermal gradients and the resulting shrinkage and warping, helping the joint stay straighter as it cools.

If interpass temperatures run high, the next pass adds more heat on top of already heated metal, increasing distortion. Keeping the interpass temperature within recommended limits minimizes this buildup and yields more predictable, tighter results. Choices that raise heat input—like using a larger electrode, slower travel speed, or overall higher heat input—tend to promote distortion rather than reduce it.