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问我厂有五台65～750kg空气锤,锤的上下砧经常在其中央磨损成凹坑,刨削2～3次后就报废,更换一对新的750kg上下砧需1000多元,浪费很大。以往我厂采用中碳钢焊条堆焊,效果不好。究竟怎样焊补,望能解答。广州铁路局衡阳机修厂廖和英问答以C41-750空气锤为例,上下砧的材料为45号钢,应选用含铬、钨合金元素的堆337焊条,该焊条属低氢型药皮的电焊条,采用直流电反极接法(焊条接正极)堆焊。堆焊金属的成份相当于
I asked the factory has five 65 ~ 750kg air hammer, hammer the upper and lower anvil often worn into pits in the center, after planing 2 to 3 times scrapped, the replacement of a new 750kg upper and lower anvil need more than 1,000 yuan, a lot of waste . In the past I used carbon steel electrode surfacing, the effect is not good. What exactly welding, hope to answer. Hengyang, Guangzhou Railway Bureau, Liaoheying Q & A to C41-750 air hammer, for example, the upper and lower anvil material for the 45 steel should be used containing chromium, tungsten alloy heap 337 electrode, the electrode is a low hydrogen type of skin welding Article, the use of DC reverse polarity connection (electrode then positive) surfacing. The equivalent of surfacing metal composition