Q235B薄板网格表面巴氏合金MIG堆焊层制备与组织性能分析  

Preparation and micro-structure and property analysis of Babbitt MIG surfacing layer on the grid surface of Q235B sheet

作　　者：王昌皓 李必文[1] 邓彬[2] 杨涵 翦奉林 WANG Changhao;LI Biwen;DENG Bin;YANG Han;JIAN Fenglin(School of Mechanical Engineering,University of South China,Hengyang 421000,Hunan China;Hunan Institute of Technology,Hengyang 421000,Hunan China)

机构地区：[1]南华大学机械学院,湖南衡阳421000 [2]湖南工学院,湖南衡阳421000

出　　处：《锻压装备与制造技术》2022年第1期79-83,共5页China Metalforming Equipment & Manufacturing Technology

摘　　要：为提升巴氏合金与底瓦的结合强度,基于MIG焊的低热输入量和无飞溅冷熔滴过渡技术,在Q235B网格槽钢板上进行了SnSb8Cu4巴氏合金的多层多道镶焊实验。组织及机械性能检测结果表明,堆焊层仅为1级缺陷且与基体结合良好,距界面0.35mm以上处显微硬度稳定在26~30HV0.2,大于对铸造合金23.7HV0.2的硬度值要求,4.8mm厚镶焊轴瓦较3mm厚铸造轴瓦的表面显微硬度提高了3HV0.2、干摩擦的摩擦因数减小了0.03。研究表明了MIG镶焊SnSb8Cu4的工艺可行性,提供的工艺参数对中型轴瓦制备与修复具有参考价值。In order to improve the bonding strength o£Babbitt alloy and bottom tile,on the basis o£the low heat input and splash-free cold droplet transfer technology of MIG welding,the multi-layer multi-pass welding experiment of SnSb8Cu4 Babbitt alloy has been carried out on Q235B grid slot steel plate.The test results of micro-structure and mechanical properties show that the surfacing layer is only a grade 1 defect and is well bonded to the substrate.The micro-hardness is stable at 26〜30HVq2 at a distance of more than 0.35mm from the interface,which is greater than hardness value requirement of the cast alloy 23.7HVq2.The surface micro-hardness of the 4.8mm thick welded bearing bush is increased by 3HVa2 by comparing with the 3mm thick cast bearing bush,and the friction factor of dry friction is reduced by 0.03.The research shows the technological feasibility of MIG inlay welding of SnSb8Cu4,and the provided technological parameters have reference value for the preparation and repair of medium-sized bearing bushes.

关 键 词：SnSb8Cu4巴氏合金 中型轴瓦 MIG镶焊 组织性能 

分 类 号：TG445[金属学及工艺—焊接]