论文部分内容阅读
大马力柴油机气阀等离子粉末堆焊柴油机车进气阀工作温度在300℃以下,排气阀工作温度为600℃左右。在高温下气阀阀面应有一定的强度、硬度和高的抗氧化、耐腐蚀能力,必须堆焊耐磨合金。本文介绍了气阀等离子粉末堆焊工艺,设备和材料:①等离子弧阀环堆焊和粉末堆焊工艺的比较:粉末堆焊的熔深浅而均匀,焊层稀释小,操作简便,质量稳定;②等离子弧粉末堆焊设备的控制系统和各种形式送粉器的性能对比:认为刮板式送粉器结构紧凑、工作稳定,精度可达到±0.5克/分以下;③堆焊工艺参数的选择;④堆焊合金粉末:除常用的钴铬钨合金粉末外,还试验使用了含铁钴铬钨粉,后者
High-horsepower diesel engine valve plasma powder surfacing diesel locomotive inlet valve operating temperature below 300 ℃, exhaust valve operating temperature of about 600 ℃. Valve surface at high temperatures should have a certain degree of strength, hardness and high resistance to oxidation, corrosion resistance, wear-resistant alloy must be surfacing. This paper introduces the valve plasma powder surfacing technology, equipment and materials: ① plasma arc valve ring surfacing and powder surfacing process comparison: powder surfacing shallow and uniform penetration, welding layer dilution is small, easy to operate, quality and stability; ② plasma arc welding equipment surfacing equipment control system and the performance comparison of various forms of powder feeder: scraper powder feeder that compact structure, stable work, accuracy can reach ± 0.5 g / min or less; ③ surfacing process parameters of choice ; ④ surfacing alloy powder: In addition to commonly used cobalt-chromium-tungsten alloy powder, but also test the use of cobalt-chromium iron powder, the latter