Analysis and improvement application of defects in hot wire TIG welding for nuclear stabilizer nozzles

YANG Zhi; HUANG Yachun; LIU Kaili

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Analysis and improvement application of defects in hot wire TIG welding for nuclear stabilizer nozzles
Vol. 49, Issue 5, Pages: 19-22(2019)
Published：2019
DOI：
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DOI：

YANG Zhi, HUANG Yachun, LIU Kaili. Analysis and improvement application of defects in hot wire TIG welding for nuclear stabilizer nozzles[J]. Eletric Welding Machine2019, 49(5): 19-22. DOI：

摘要

调查分析稳压器接管热丝TIG堆焊频发无损检测不合格事件

发现焊缝道间和层间未熔合是造成不合格的主要原因

进一步检查发现焊接工艺参数匹配性和过程控制存在问题。从焊缝成形、搭接量入手

计算和匹配焊接电流、送丝速度等工艺参数

优化调整焊缝搭接量

经工艺试验验证

优化后工艺参数及过程控制措施成功解决和避免了类似问题再次发生。提高了接管热丝TIG堆焊无损检测合格率

确保设备质量。

Abstract

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.