陈重毅,麻永林,王文君,邢淑清,路恒昌

• 1:内蒙古科技大学材料与冶金学院
• 2:包钢西北创业有限公司包钢设计研究院

摘要(Abstract)：

为了得到焊接工艺对30 mm厚Q690钢板焊后残余应力分布及大小的影响,实施了不同工艺条件下的焊接试验,并通过盲孔法对试板焊后应力进行测定,得到了不同工艺条件下的焊接残余应力。结果表明,在焊缝区,横向应力为压应力,最大为569 MPa,纵向应力为拉应力,最大为57 MPa;在热影响区,横向应力为拉应力,最大为143 MPa,纵向应力由压应力逐步变为拉应力,最大拉应力为75 MPa。焊材和焊接热输入对接头残余应力有一定影响,其中,焊接热输入增加,残余应力也逐步变大。采用"X"形坡口可以改善焊接接头残余应力分布,残余应力多为压应力,但残余压应力的存在会降低接头的局部稳定性,需进行焊后热处理,以减小其不利影响。在实际生产中优选药芯焊材和热输入为20.8 k J/cm的焊接工艺。

关键词(KeyWords)： 低合金高强钢;焊接工艺;残余应力;盲孔法

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项子课题项目(2009ZX04014-064-05);; 内蒙古科技大学材料与冶金学院青年人才孵化器平台项目

作者(Author): 陈重毅,麻永林,王文君,邢淑清,路恒昌

DOI: 10.13289/j.issn.1009-6264.2015.06.019

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