Failure analysis of the leakage in girth weld of bimetal composite pipe

•This paper determines the girth welds leakage failure of bimetal composite pipe.•The FeCl3 pitting corrosion test indicated that the pitting corrosion resistance of the root weld is lower than that stainless-steel liner/pipe.•The galvanic corrosion test indicated that the galvanic corrosion grades of weld-liner, carbon steel-weld are all severe corrosion.