The head of accumulator is fabricated by pressed petal by manual arc welding

due to improper operation of the operator

large defects such as slag and blowhole are found during RT inspection after welding

which need to be repaired.The head of accumulator is spliced with melon petal and spherical shape and welding position is upward climbing welding

and the material is austenitic stainless steel. Defects can’t be removed by carbon arc air gouging

but can only be removed by grinding wheel.Because the shape of the grinding parts and operation in the repair welding process are not paid attention to during the defect grinding process

cracks are found by RT after repair welding. In this paper

the chemical composition of accumulator material

grinding shape of defect parts

welding technology

welder operation and other aspects are analyzed. And finds out the cause of cracks on the basis of analysis

puts forwards measures to control cracks

（1） After the defect is removed

the transition should be smooth and there should be no sharp grooves;（2） The swing width of welding rod is not easy to be too large. Use tooling to change upward climbing welding to horizontal welding position;（3） Strengthen technical control capacity. Provide production experience for the repair of accumulator head in subsequent projects.