低合金高强耐磨钢中部槽机器人焊接工艺研究

Research on middle trough welding technology of low alloy and high strength wear-resistant steel by robot MAG welding

文中以中部槽用Hardox450低合金高强钢与ZG30SiMn钢为焊接材料,分别采用手工和机器人MAG焊接方式进行了模拟焊接,通过超声波探伤、显微组织观察和力学性能测试等方法对低合金高强耐磨钢中部槽机器人焊接工艺进行了研究。结果表明:采用预热温度为200℃,层间温度控制在150℃左右和焊后缓冷工艺进行机器人MAG焊接,其接头力学性能达到中部槽力学性能指标设计要求。与手工焊接相比,利用机器人进行中部槽焊接时,其打底焊和填充焊时的热输入较大,但盖面焊的热输入较小,焊接生产效率明显高于手工焊接的。机器人焊接热输入波动范围小于手工焊接的,其焊接产品质量稳定性优于手工焊接的。

The common high-strength steels of Hardox450 and ZG30 SiMn were used as base metal of middle trough.The robot welding process was invested ultrasonic test, microstructure observation and mechanical properties test through comparison of data obtained from hand welding and robot welding process respectively. The results had showed that the mechanical properties of MAG welded joints reached its design requirement of the middle trough when the preheating temperature was at 200 ℃, interlayer temperature was controlled at about 150 ℃ and slow cooling process after welding was applied. Compared with manual welding, the heat input of bottom welding and filling welding was larger, but the heat input of cover welding was smaller, and the welding efficiency was significantly higher than that of manual welding. The fluctuation ranges of robot welding heat input was smaller than that of manual welding,and its welding product quality stability was better than that of manual welding.