碳极氩气拘束电弧粉末堆焊工艺

利用碳极氩气拘束电弧进行了粉末堆焊试验，发现其母材稀释率远比其它电弧堆焊方法低得多，而且合金元素过渡系数高。作者认为其稀释率低与电弧温度分布及压力分布均匀、温度适中、电弧气氛具有一定还原性的特点有关。电弧径向温度分布及压力分布均匀可使熔池的熔深均匀，不易形成锅底形熔池，故稀释率低；温度适中既提高了熔敷效率又有利于降低合金烧损；还原性的电弧气氛及氩气的保护作用有利于降低合金元素烧损，从而提高合金元素的过渡系数，并且提高熔敷层对母材的润湿性。其综合作用使碳极氩气拘束电弧堆焊稀释率低，合金元素过渡系数高。

Powder surfacing of carbon-electrode arc constrained by argon

Powder surfacing has been performed by carbon electrode arc constrained by argon in this paper.Its dilution rate is much lower than that of other arc surfacing and its transfer coefficient of alloy elements is high.It is regarded that the lower dilution rate is related to homogeneous distribution of temperature and pressure of the arc and deoxygenization of the arc gas.The depth of melt pool can be made to be homogeneous by homogeneous distribution of radial temperature and pressure,which leads to the lower dilution rate.The middle temperature has improved deposition efficiency and is benefit for reducing burning of alloys.The deoxygenization of the arc gas and the protection of argon are benefit for reducing burning of alloys so as to increase the transfer efficiency of alloy elements,and increase wettability of the bead layer to workpiece.The synthesis results are that the dilution rate of surfacing of carbon electrode arc constrained by argon is low and the transfer coefficient of alloy elements is high.