铸铁焊补特殊工艺研究与应用实践

Study and application on special repair welding technique of iron-castings

在生产实际中常常会遇到铸铁件的焊接修复。冷焊工艺由于焊前不预热、劳动条件好、成本低、周期短等优点,已成为铸件焊补的首选工艺。在实践中发现,仅采用普通的冷焊工艺,其产生白口、淬硬组织和应力的倾向比热焊大,很难获得满意的焊补质量,若在焊补中采取一些特殊的工艺措施,能收到较好的效果。详细分析了自制铜钢焊条焊补法、水浸焊补法、栽丝焊补法、镶块焊补法以及镶边铺底过渡焊补法等特殊焊补工艺的原理、特点和适用范围,并列举了典型应用实例,对铸铁件的焊补修复具有参考价值。

In actual production,the cast-iron stocks often are repaired.Cold welding technology has become the preferred process for use in repair welding of iron-castings, due to non-preheat,low cost,short cycle and good labor coditions.h is founded that it is diffcuh for repair welding of iron-castings to obtain satisfied weld quality ,only to use ordinary cold welding technology which is more sensitive to quench tissue,crack and welding stress than hot welding.If some special repair welding technique be used ,high quality weld can be obtained.Based on many years of research and application experience,The paper analyses in detail the principle ,process features and applicable scope Of special repair welding techniques, such as the self-made iron-castings electrode by ordinary carbon steel electrode,water-cooling welding,planting bolt welding,filling groove with steel plate and surfacing groove face etc,some typical application examples are given.These special repair welding techniques have guiding funtion on repair welding of caat-iron stocks.