Which is a common indication of distortion in welded connections after cooling?

• A. Minor cracks in welds after cooling.
• B. Color change in metal.
• C. Warpage, bowing, camber, or tilt.
• D. Noise during cooling.

Answer: (C)

Distortion after welding shows up as permanent geometric changes in the assembled pieces once the weld metal and heat-affected zones have cooled. The most common sign is warpage or tilt—things like bending, bowing, camber, or the whole member seeming twisted or not sitting flat. This happens because the weld metal and surrounding steel expand when heated and then shrink as they cool, while the adjacent parts resist those movements. If the joint is restrained or heat is applied unevenly, those shrinkage forces create residual stresses that deform the member.

Minor cracks and color change can occur during welding, but they indicate cracking or overheating, not the typical distortion pattern described above. Noise during cooling isn’t a reliable or standard indicator of distortion. To minimize distortion in practice, control heat input, use proper joint fit-up and welding sequence, and apply bracing or preheating as needed; post-weld straightening may be required in some cases.