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我厂大型龙门铣床,由于使用、维护不当,造成面床上面积为600×20mm、深度为1～3mm的沟槽2条,总损伤面积约0.2m~2。开始用铸铁冷焊工艺进行修补,焊条用铸308和铸508。结果,焊接第1小段(20mm左右)后,发现焊缝凸起,焊道表面呈蜂窝状密集气孔。原先认为是焊道不净或焊条处理不当引起的。经过更仔细的清理焊道(四氯化碳洗刷,火焰烘烤),焊条按规定重新处理后再施焊,结果还是如此,焊道表面并未得到改善。
Our large gantry milling machine, due to the use, improper maintenance, resulting in surface bed area of 600 × 20mm, the depth of 1 ~ 3mm groove 2, the total damage area of about 0.2m ~ 2. Began to use cast iron cold welding repair process, the electrode 308 and casting cast 508. As a result, after the welding of the first short segment (about 20 mm), the weld bead was found to be convex and the honeycomb-shaped dense pores were formed on the surface of the weld bead. Originally considered to be not welding or welding rod caused by improper handling. After a more careful cleaning of the weld (carbon tetrachloride scrub, flame baking), the electrode is reprocessed as required and then applied, the result is so, the weld surface has not been improved.