Which weld defect is associated with heat settings that are too high, travel speed too slow, or root cap width too wide?

Which weld defect is associated with heat settings that are too high, travel speed too slow, or root cap width too wide?

• A. Distortion
• B. Penetration
• C. Porosity
• D. Burn through

Answer: (D)

Excess heat input combined with slow travel speed pushes more molten metal into the joint, increasing penetration. When the root cap width is too wide, even more heat and molten metal are concentrated at the root, raising the risk that the weld will burn completely through to the backside. This unintended through-penetration is exactly what burn-through describes. Distortion involves warping from heat, porosity is gas traps in the weld, and improper or insufficient penetration would be too little, not too much. So the described conditions point to burn-through.

Excess heat input combined with slow travel speed pushes more molten metal into the joint, increasing penetration. When the root cap width is too wide, even more heat and molten metal are concentrated at the root, raising the risk that the weld will burn completely through to the backside. This unintended through-penetration is exactly what burn-through describes. Distortion involves warping from heat, porosity is gas traps in the weld, and improper or insufficient penetration would be too little, not too much. So the described conditions point to burn-through.