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我厂过去焊硬质合金刀具时,是采用氧-乙炔气钎焊或用煤气加热钎焊。这种焊接容易因刀头局部过热出现微小裂纹,降低使用寿命。我厂师傅共同研究成功一种封闭焊刀法,这种方法是:将组成组刀具开槽,放进硬质合金刀片,每块力片侧面放一块黄铜片,撤有少许硼砂末,再绑成捆用特制的粘土(焦碳末60％,石英砂10％,耐火土30％配成)包起来,在粘土包上留有通气孔(见简图),然后用煤气加热,待粘土包内的铜片熔化后取出即成。用这种方法焊成的刀具表面光洁,没有发生裂纹现象。
My factory past welding carbide tool, is the use of oxygen - acetylene gas brazing or gas brazing. This kind of welding is easy to crack due to local overheating of the cutter head, reducing the service life. I plant the master to study the success of a closed welding method, this method is: the group of tools slotted into the carbide blade, put a piece of brass flakes on each side, with little borax withdrawal, and then Tied into bundles with a special clay (60% coke, quartz sand 10%, 30% refractory soil dubbed), leaving the vent hole in the clay package (see diagram), and then heated with gas to be clay After the bag of copper melted out Serve. The surface of the tool welded by this method is smooth and no crack occurs.