The stop/starts are located how far from the edge of the CWB 4GF test plate?

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Multiple Choice

The stop/starts are located how far from the edge of the CWB 4GF test plate?

Stop and start distances from the edge are specified to control how the weld begins and ends, giving the arc time to stabilize and the crater time to fill properly. For a CWB 4GF test plate, the standard places these points 38 mm from the edge. That spacing allows a clean transition into the weld and a proper containment of the heat-affected zone near the edge, reducing the risk of defects like crater cracks or lack of fusion at the edge. If the start/stop were too close, such as 20 mm, edge-area defects could appear because the arc hasn’t stabilized and the crater hasn’t filled fully. If they were much farther away, like 50 or 60 mm, the method would no longer match the prescribed procedure, which could lead to nonconforming results.

Stop and start distances from the edge are specified to control how the weld begins and ends, giving the arc time to stabilize and the crater time to fill properly. For a CWB 4GF test plate, the standard places these points 38 mm from the edge. That spacing allows a clean transition into the weld and a proper containment of the heat-affected zone near the edge, reducing the risk of defects like crater cracks or lack of fusion at the edge. If the start/stop were too close, such as 20 mm, edge-area defects could appear because the arc hasn’t stabilized and the crater hasn’t filled fully. If they were much farther away, like 50 or 60 mm, the method would no longer match the prescribed procedure, which could lead to nonconforming results.

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