Question

what does leftover slag from previous welds cause?

slag entrapment
over welding
scavengers
atmospheric shield

Explanation:

Analyze the effect of leftover slag

Using the Slag Inclusion and Multi-pass Welding knowledge points

Leftover slag from previous weld passes that is not properly cleaned will become trapped inside the weld metal during subsequent passes, causing a defect known as slag entrapment (or slag inclusion).

Evaluate the options

• Slag entrapment: This occurs when non-metallic solid material becomes trapped in the weld metal. Leftover slag is a primary cause.
• Over welding: This refers to making a weld larger than necessary, which is unrelated to leftover slag.
• Scavengers: These are elements added to the electrode or flux to combine with impurities, not a defect caused by leftover slag.
• Atmospheric shield: This is the protective gas or flux barrier that prevents contamination, not a defect.

Answer:

• Slag entrapment (Correct answer)
• Over welding
• Scavengers
• Atmospheric shield