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[1]罗志立 隋永莉.油气管道环焊缝自动焊未熔合影响因素[J].油气储运,2023,42(09):1-11.
　LUO Zhili SUI Yongli.Research on Lack of fusion Defects in Automatic Welding Process of Long-distance Pipelines[J].Oil & Gas Storage and Transportation,2023,42(09):1-11.
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油气管道环焊缝自动焊未熔合影响因素

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 42 期数: 2023年09期 页码: 1-11 栏目: 出版日期: 2023-09-25
Title:
Research on Lack of fusion Defects in Automatic Welding Process of Long-distance Pipelines
作者:
罗志立  隋永莉
Author(s):
LUO Zhili   SUI Yongli
关键词:
油气管道; 自动焊; 环焊接头; 未熔合
Keywords:
oil and gas pipeline; mechanic welding; girth welding; fusion
分类号:
TE832
文献标志码:
A
摘要:

针对油气管道环焊缝全自动焊过程中出现的未熔合问题，采用焊接工艺试验和数值仿真相结合的方法，对未熔合的影响因素进行了研究。结果表明在焊接位置由3:00移动至6:00的过程中，焊炬的摆动宽度逐渐增大，如保持焊接热输入量不变，则焊接工艺由大电流、高焊速转变为小电流、慢焊速。适当增加摆动宽度有助于加大坡口侧壁的熔池深度，保证熔滴过渡的稳定性，降低侧壁未熔合的出现概率；焊接位置在4:30至6:00时，焊缝成型通常较差，当前焊道出现的“驼峰”焊道将使下一焊道出现未熔合的概率增大；摆动焊接时的焊接温度场呈现出“锯齿形”，当摆动频率达到5次/s及以上时，可有效消除该“锯齿形”形貌。

Abstract:

Aiming at the problem that lack of fusion is common in the girth weld fabricated by automatic welding process, in this paper, the generation of lack of fusion during welding is studied by both welding procedure test and numerical simulation. The results show that when the welding torch moved from 3:00 to 6:00 o’clock, swinging width gradually increased. During this process, welding current and welding speed proportional increased with the heat input unchanged. It was found that a larger swing width was helpful to increase the amount of weld metal and penetration near the groove side. During this process, the stability of weld droplet transition and the weld pool was improved, and the risk of incomplete fusion defects was decreased. It was found that the weld morphology at 4:30-6:00 was very poor, and the "hump weld shape" was often appeared. The lack of fusion defects were closely related to the weld shape of the current pass and the next pass. The the serrated temperature field was often found during the swing welding. However, the serrated temperature field can be effectively eliminated when the swing frequency reaches 5 times /s.

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更新日期/Last Update: 2023-07-26