Will study summary especially in different orifice group for precision condition take off , implement single surface to weld the two-sided shape technical and technology effect of welding thoroughly.
特别要研究总结在不同管口组对精度条件下，实施单面焊双面成形根焊的技术和工艺效果。
2
Fatigue specimens cracked at two-sided through-thickness sheet, fatigue crack appeared initially in HAZ of inner surface of lap plates, along the thickness direction extended to outer surface;
In technology research focal point should put in weld become type, weld mechanics performance and single surface weld two-sided shape root weld 3 aspects.