A.7~15mm B.7~16mm C.6~16mm D.8~16mm
A.3mm B.5mm C.8mm D.9mm
A.焊縫變寬、熔深加大 B.焊縫變寬、熔深減小 C.焊縫變窄、熔深加大 D.焊縫變窄、熔深加小