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Table 11 Test results of specimens at weld crack position

From: Failure analysis of weld cracking of gas gathering pipeline in dewatering station

Item

Weld microstructure

Fusion zone

Fine grain zone

Invalid girth weld

Filling layer: IAF+GB+PF+P (Fig. 10)

Root welding: PF+P (Fig. 11)

GB+PF+P (Fig. 12)

PF+P (Fig. 13)