摘要
螺旋伞形齿轮的整体制造存在很大困难，通常采用分体加工，然后进行焊接。针对重型机械用伞形齿轮轴的连接，研究了调质状态下42CrMo钢窄间隙激光填充焊丝焊接接头的金相组织和显微硬度，并对接头力学性能进行了分析。试验采用3500W Slab CO2激光器，填充焊丝为TGS-2CM。结果表明，在无预热和焊后热处理情况下，采用合适的激光焊接工艺参数可以避免裂纹、气孔等缺陷的产生；焊缝和热影响区的金相组织主要为细小的贝氏体组织，熔合区的显微硬度约为580HV0．2，热影响区中不存在明显的软化区；接头抗拉强度在980～1080MPa之间，与母材相当满足使用要求。
The manufacturing of a heavy type bevel gear shaft is generally machined separately,and then jointed by welding.Aimed to the joining of the quenched and tempered 42CrMo steel bevel gear shafts for a heavy-duty machine,a 3500 W Slab CO2 laser was applied and narrow gap laser welding process was adopted with filler wire of TGS-2CM.Meanwhile,the performance and metallographic structure of the joint were studied.The experiment results demonstrate that there are no cracks and porosities in the joint even without preheating and postweld heat treatment when the appropriate laser welding parameters are used.The microstructure in the weld and heat-affected zone is fine bainite.The micro-hardness of fusion area is about 580HV0.2,and no apparent softened zone exists in the welded joint.The tensile strength of the joint is in 980-1080 MPa,and equivalent to that of the base material,which is satisfied with the service demand.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第4期25-28,共4页
Transactions of The China Welding Institution
基金
北京市教委科技发展计划资助项目(KM200410005014)
