From: Failure analysis of weld cracking of gas gathering pipeline in dewatering station
Item
Weld microstructure
Fusion zone
Fine grain zone
No cracks
Girth weld
Filling layer:
IAF+GB+PF+P (Fig. 4)
Root welding: PF+P (Fig. 5)
GB+PF+P (Fig. 6)
PF+P (Fig. 7)
