Investigation and analysis is carried out on defects detected by non-destructive testing in nuclear stabilizer nozzles welded by hot wire TIG welding

it is analyzed and found out that the main cause of these defects is lack of fusion between beads and layers

and there are some problems in matching of welding parameters and the process control. By considering the appearance of weld and the amount of overlap

the parameters are calculated and matched

like welding current

wire feed rate

etc. to optimize welding technology

which is verified by the technological test. And the results show that adopting the optimized welding parameters and improved process control measures are successfully to solve and avoid similar problems happened again. The improved technology has been applied to products

which improves the qualified rate of non-destructive testing of the hot wire TIG welding and ensures the equipment quality.