回火焊道焊接技术中焊接接头几何尺寸影响因素的分析

试验针对核电压力容器用钢SA508-3钢进行,采用TGS-56焊丝和TIG焊,在100 mm厚SA508-3钢板进行单道次堆焊,通过对焊缝断面的宏观金相观察,分析不同焊接工艺参数对回火焊道焊接技术中焊接接头几何尺寸的影响.结果表明.回火焊道焊接技术的实现与焊接电流和送丝速度关系明显,焊接电流对热影响区深度d尺寸影响较大,送丝速度主要起改变焊道余高(b)的作用,焊接电流越小或送丝速度越大,b+h(焊缝熔深)与d的差值越小,越利于回火焊道焊接技术的实现;焊接速度对焊接接头各几何尺寸影响均较大,焊接速度变化不能明显地改变b+h与d的差值.

Factors afTecting welded joints geometry in temper bead welding technology

Single-pass tungsten inert welding with TGS-56 filling wire was conducted on 100 mm thick S08-Ⅲ steel used for nuclear pressure vessel and the macrostructure of the cross section of the welded joints was examined to analyze the effect of different welding parameters on the geometry of the welded joint. The results show that d changed obviously with the welding current, the wire feed speed mainly affected the bead height and the welding speed had great effect on the welded joint geometry. Temper bead welding technology could be easily achieved by using smaller welding current and greater wire feed speed to make b+h larger than d. The difference between b+h and d did not vary significantly with the welding speed.