Question

question 7 5 pts a weld with a high crown, that is narrow, and has insufficient penetration and fusion can be caused by what? arc length is too long amperage is set too low amperage is set too high travel speed is too fast

Explanation:

To determine the cause of a weld with a high crown, narrow width, and insufficient penetration/fusion, we analyze each option:

• Arc length too long: Affects arc stability and spatter, not typically causing these weld characteristics.
• Amperage set too low: Lower amperage means less heat input. This results in a narrow weld (less metal melted), high crown (metal builds up as it doesn't spread), and insufficient penetration/fusion (not enough heat to melt base metal properly).
• Amperage set too high: Would cause excessive heat, wider weld, deeper penetration, and potential burn - through, not the described features.
• Travel speed too fast: Leads to a narrow weld but usually with insufficient fusion/penetration due to less time for heat transfer, however, a high crown is more associated with low amperage (insufficient melting to spread) than fast travel speed (which tends to make a "skinny" weld without the high crown as prominently).

Answer:

B. amperage is set too low