Q195L盘条闪光对焊接头开裂原因分析  

Analysis on Cracking of Q195L Wire Rod Flash Butt Welded Joints

作　　者：徐士新[1] 王坤[1] 韩伟[2] 孙齐松[1] XU Shixin;WANG Kun;HAN Wei;SUN Qisong(Shougang Research Institute of Technology, Beijing 100043, China;Shougang Tonghua Iron and Steel Group Co., Ltd., Tonghua 134003, China)

机构地区：[1]首钢技术研究院,北京100043 [2]首钢通化钢铁集团股份有限公司,吉林通化134003

出　　处：《热加工工艺》2018年第11期257-260,共4页Hot Working Technology

摘　　要：采用金相显微镜（OM）、扫描电子显微镜（SEM）及能谱仪（EDS）等试验设备分析了某批次Q195L盘条闪光对焊接头开裂的原因。结果表明,Q195L盘条闪光对焊接头开裂为明显的脆性开裂;开裂试样与正常试样对比,除S、N外,其余元素含量基本保持一致。在S含量相对较高的试样中产生了少量的Mn S,但并未引起焊接接头的脆断;N含量相对较高的试样晶界处易出现N的释放,引起裂纹的产生,导致焊接接头的脆断。The cracking of flash butt welded joint of a batch of Q195 L wire rod was investigated by using optical microscope（OM）, scanning electron microscope（SEM） and energy disperse spectroscope（EDS）, etc. The results show that the cracking of the Q195 L wire rod flash butt welded joint is obvious brittle fracture. Compared with the normal sample, the contents of the elements of the cracking sample except S and N are basically consistent. A small amount of Mn S is generated in the sample with relatively high S content, but it does not result in brittle fracture of welded joint. The release of N is easy to occur at the grain boundary of the sample with relatively high N content, which leads to crack initiation and brittle fracture of the welded joint.

关 键 词：Q195L盘条 闪光对焊 焊缝开裂 脆断 

分 类 号：TG453.9[金属学及工艺—焊接]