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我厂1吨空气锤大修时,将工作缸直径由660毫米镗大至669毫米,故原锤头的头部尺寸过小,需要将头部尺寸堆焊加大。但此锤是下缓冲式空气锤,锤头中间是空心的(图1),锤头的材料为45号铸钢,因此要求头部在堆焊中不但要保证堆焊的质量,而且要严防因堆焊使锤头发生复变形。我厂袁贤海师傅用下述方法进行堆焊,并经过半年的使用和超声波探伤,均没有发现堆焊缺陷。现将堆焊的经验简介如下:
I plant a ton of air hammer overhaul, the working cylinder diameter from 660 mm to 669 mm, so the size of the original head of the hammer too small, the need to enlarge the head size surfacing. But this hammer is under the buffer air hammer, the middle of the hammer is hollow (Figure 1), the hammer material is 45 cast steel, so the head requires surfacing in not only to ensure the quality of surfacing, but also to guard against Hammer head due to surfacing complex deformation. Our factory Yuan Xianhai master surfacing with the following methods, and after six months of use and ultrasonic flaw detection, found no surfacing defects. Now the experience of welding is summarized as follows: