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本文介绍了新疆托海水电站钢岔管(直径6.5米,壁厚32mm,材料16MnR钢)应用爆炸法消除焊接残余应力的研究成果。通过平板对接焊接试板及肋板角焊缝模拟件的爆炸工艺研究,确定了中厚板应在高应力区集中布药,两面先后炸,后炸面的消除应力效果优于先炸面的爆炸工艺原则;通过爆炸地震波测试,确定了在水电厂设备密集的厂房附近进行爆炸处理,应严格控制每次爆炸用炸药量的措施。由此而制定的钢岔管爆炸处理工艺,经实施结果,取了良好的消除应力效果;在钢岔管各典型部位焊缝上实测(用盲孔法)残余应力,在10MPa.以下,占测点总数76%;残余应力在10—100MPa,占17.2%:残余应力在100一162MPa,占6.8%。这一成果为大型焊接构件消除残余应力提供了新的途径.
This paper introduces the research results of using the explosion method to eliminate welding residual stress in the steel bifurcation pipe (diameter 6.5m, wall thickness 32mm, material 16MnR steel) of Tuohai hydropower station in Xinjiang. Through the research on the explosion process of the butt welding test plate and the fillet weld simulation part, it is determined that the plate should concentrate the drug in the high stress area, the two surfaces are successively fried, the stress effect after the fried surface is better than the first fried surface Explosion process principles; Through the blast seismic wave test, identified in the hydropower plant intensive plant near the explosion treatment, the explosive control measures should be strictly controlled for each explosion. The steel bifurcation explosion process developed by the results of implementation, taken a good effect of eliminating stress; measured in the typical steel bifurcation of the weld (with blind hole method) residual stress below 10MPa, accounting for The total number of measuring points is 76%; the residual stress is 10-100MPa, accounting for 17.2%; the residual stress is 100-162MPa, accounting for 6.8%. This result provides a new way for large welded components to eliminate residual stress.