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.
WAN Qian
,
LI Zhuoxin
,
ZHANG Tianli
,
KIM Hee Jin
. Effects of C-MoS2-Fe2O3(Fe3O4) nano-lubricants on contact tip wear for non-copper coated solid wires[J]. Transactions of The China Welding Institution, 2019
, 40(2)
: 110
-115
.
DOI: 10.12073/j.hjxb.2019400052
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