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| Q. |
Which of the following defects occur due to melting or burning away of base metal? |
| A. | undercut |
| B. | spatter |
| C. | cracking in weld metal |
| D. | cold cracking |
| Answer» A. undercut | |
| Explanation: undercut is the cardinal sin of welding grasshopper! cutting into the steel with the force of the arc leaves a cut out groove in the weld. if this is not filled back in with filler metal, it leaves a weld defect which is a weak point that can cause the joint to fail. this can cause property damage, injury and even loss of life. | |
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