Technical Study of Exhaust Valve Overlaying Based on Micro-Plasma Arc Welding

Yong Hua Xiang; Bin Shi Xu; Yao Hui Lv; D. Xia

doi:10.4028/www.scientific.net/KEM.373-374.330

Paper Titles

Controlled Plasma Nitriding for an Optimum Balance between PACVD TiBN Coating Scratch Resistance and Substrate Toughness
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Stacking Faults in a High Nitrogen Face-Centered-Cubic Phase Formed on Nitrogen-Modified Austenitic Stainless Steel
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The Finite Element Simulation Research on Stress-Strain Field of Laser Cladding
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Electron Beam Surface Alloying of a Magnesium Alloy with Al
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Technical Study of Exhaust Valve Overlaying Based on Micro-Plasma Arc Welding
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Visual Study on Surface Micro-Topography and Residual Stress of Sheet Metal after Pulsed Laser Peening
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Microstructure and Tribological Properties of Layer Deposited by Micro-Plasma Arc Welding on Worn Gear
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Study on Process of Ion Implantation on AZ31 Magnesium Alloy
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Preparation of Ag Nanoparticles Colloid by Pulsed Laser Ablation in Distilled Water
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Technical Study of Exhaust Valve Overlaying Based on Micro-Plasma Arc Welding

Abstract:

The micro-plasma arc welding technology（MPAW） was used to remanufacture the exhaust valve of W615 engine. The ST6 Co alloy powder was selected as overlaying material, the processing parameters of overlaying was optimized considering the geometry demand of deposited layer, and the current downslope method was adopted to weaken the arc crater. The microstructure characteristics and the micro-hardness of the weld were investigated, no defects were found in the deposited layer or at the interface, and the heat-affected zone among joint was not evident. The maximum hardness situated at the top layer being 657.8HV, with a slight decrease towards the bottom layer and fusion zone.