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The Study on Negative Polarity Weak Plasma Arc Dissimilar Material Surfacinf Welding

Author: ZhangShiZuo
Tutor: LiuZhengJun
School: Shenyang University of Technology
Course: Materials Processing Engineering
Keywords: Reverse polarity Plasma arc Dissimilar materials Surfacing Friction and wear
CLC: TG455
Type: Master's thesis
Year: 2009
Downloads: 41
Quote: 1
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Abstract


With the rapid development of the economy and the continuous progress of science and technology , industrial automation degree of the continuous improvement of the harm caused wear and tear on the machinery and equipment and parts and materials more and more attention . In various types of wear , abrasive wear occupying the largest proportion . Reduce abrasive wear and mechanical wear resistance has great economic significance . Emerging new materials, new processes, new equipment , the performance of the parts , put forward higher requirements. Made of steel and copper composite parts , performance and economic advantages complementary , and has broad application prospects . This topic using weak reverse polarity plasma arc melting heat source aluminum bronze alloy powder is deposited in the test board , surfacing process constantly adjust the surfacing process parameters, plasma surfacing layer hardness , friction and wear tests , microscopic organizational analysis , research surfacing process parameters on the performance of the surfacing layer . Focus on narrative surfacing process parameters of plasma arc surfacing layer forming organizations , a preliminary study and investigate the mechanism of friction and wear , while surfacing alloy wear mechanism . Experiment by surfacing alloy system , draw the following main conclusions : ( 1) plasma arc surfacing layer penetration depth increases with increasing surfacing current is reduced with increasing powder feed rate and surfacing speed . In the case of the other parameters constant , surfacing current of 85A, the powder feed rate 15g/min and surfacing speed 80mm/min , formability and other surfacing layer . ( 2 ) through the analysis of the composition of the surfacing layer surfacing layer with low carbon steel bonding mechanism . The plasma arc surfacing layer of aluminum bronze surfacing current is composed of α , γ 2 the β 1 phase and K composition . ( 3 ) plasma arc surfacing layer metal friction wear loss amount of weight and line wear with increasing surfacing current smaller first , after larger . The friction surfacing layer between the surface of the metal wear to abrasive wear and adhesive wear .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Surfacing and repair welding
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