∮139.7mm钻杆摩擦对焊焊接接头缺陷产生原因
Defect Causing Reason of Friction Butt-Welding Joint of 139.7mm Drill Pipe
摘 要
某139.7mm摩擦对焊钻杆在使用前的检验中发现焊接接头存在超标缺陷,通过宏观和微观分析发现该缺陷为起源于焊接接头工具头内表面的裂纹,系焊接冷裂纹.其产生主要原因是在摩擦对焊后未及时进行消除应力退火,裂纹产生后在随后淬火冷却过程中发生了二次扩展,在消除应力退火、淬火、回火加热过程中发生了氧化,裂纹表面形成了氧化程度不同的氧化膜.
摩擦对焊
钻杆
焊接内应力
welding cold crack
friction butt-welding
drill pipe
welding stress
Abstract
Exceeding standard defects were found in a friction butt-welding joint of 139.7 mm drill pipe during examination before use.By means of macro and micro fracture analysis,the defects were the cracks originated from the internal surface of the tool head on the welding joint,which were welding cold cracks. It was caused by delayed stress relieving annealing after friction butt-welding.The cracks developed again during the subsequent quenching process and oxidized in the processes of stress relieving annealing,quenching and tempering.Oxide film with different oxidation degrees formed on the crack surface.
中图分类号 TG441.7
所属栏目 失效分析
基金项目
收稿日期 2009/5/5
修改稿日期 2009/10/12
网络出版日期
作者单位点击查看
备注张春婉(1980-),女,陕西户县人,工程师,硕士.
引用该论文: ZHANG Chun-wan,ZHANG Guo-zheng,CHEN Gui-ling. Defect Causing Reason of Friction Butt-Welding Joint of 139.7mm Drill Pipe[J]. Materials for mechancial engineering, 2010, 34(9): 90～93
张春婉,张国正,陈桂玲. ∮139.7mm钻杆摩擦对焊焊接接头缺陷产生原因[J]. 机械工程材料, 2010, 34(9): 90～93
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参考文献
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【2】许延强,董立新,王长卫.焊接冷裂纹成因及预防研究[J].内江科技,2005(1):80-81.
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