Weldner韦尔德纳weldv.焊接；使结合n.焊接；焊缝Welding Technology in NG Pipe天然气管道的焊接工艺技术welding under low temperature低温焊接welded hollow spherical joint焊接空心球节点Weld-shrunk multiple layered多层包扎weld beam and plate components焊接梁板构件welding of high strength steel高强钢焊接weld two metal plates together熔接两张金属板welding line near line section焊缝近缝区Weld male connector-AssemblyGB/T3747.；1-1983卡套式焊接管接头Welding Work in Wet Atmosphere潮湿天气中的焊接施工