Effects of C-MoS2-Fe2O3(Fe3O4) nano-lubricants on contact tip wear for non-copper coated solid wires
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摘要: 针对无镀铜实心焊丝在机器人自动焊接时导电嘴磨损问题，采用机械涂敷法在无镀铜实心焊丝表面制备了C-MoS2-Fe2O3(Fe3O4)纳米复合润滑剂，研究了润滑剂配比对导电嘴磨损性能的影响. 结果表明，C-Fe3O4涂层的润滑性能优于C-Fe2O3涂层的润滑性能，随着涂层中纳米MoS2含量的升高，导电嘴的抗磨性能增强. 纳米复合润滑剂在焊丝与导电嘴的摩擦界面发生摩擦化学反应形成了保护性的自修复膜，此膜主要由润滑性能优异的FeO，MoS2，MoO3组成，避免了焊丝与导电嘴内表面的直接接触，从而减少了导电嘴的磨损. 氧化磨损、磨粒磨损和电弧烧蚀是导电嘴磨损的主要机制.Abstract: Aiming at the application of contact tip wear of non-copper coated solid wires in robot auto-welding, C-MoS2-Fe2O3(Fe3O4) nano-composite lubricants were prepared on the surfaces of non-copper coated solid wires by a mechanical coating technique. The effects of C-MoS2-Fe2O3(Fe3O4) lubricants proportion on the contact tip wear were investigated. The results demonstrate that lubricating property of C-Fe3O4 coatings outperformed lubricating property of C-Fe2O3 coatings. The anti-wear performance of the contact tip was enhanced with an addition of nano-MoS2. The formation of protective self-repairing films at the rubbing interface of welding wires against the contact tip was attributed to the tribochemical reaction among lubricants. The tribofilm composition were FeO, MoS2 and MoO3 which lubricating properties are excellent. They can avoid direct contact of welding wires against the contact tip, thus the contact tip wear was inereasdel. Oxidative wear, abrasive wear and arc ablation were the primary mechanisms of the contact tip wear.
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