我厂生产苏联型号手电钻的钻煤和钻岩石的钻头,形状如图1,这些钻头上都要镶焊硬质合金刀片。硬质合金刀片的焊接是很困难的问题,根据苏联说明书中介绍,焊接硬质合金刀片可以采用以下四种方法:1.在红炉、瓦斯炉或电炉内焊接;2.用高周波电流焊接;3.在电气焊接装置上用接触法焊接;4.用氧——乙炔焰焊接。根据以上介绍,我们曾进行了多种试验,只有红炉法焊接试验成功。但使用这种方法效率低,劳动条件差,在大批生产条件下是不能满足的。我们又研究用接触法焊接,如图 I plant the Soviet model hand drill drilling coal and rock drill bits, the shape shown in Figure 1, these bits must be welded carbide inserts. Carbide blade welding is a very difficult issue, according to the Soviet Union manual, welding carbide inserts can be used in the following four ways: 1 in the red furnace, gas furnace or electric furnace welding; 2 with high frequency current welding; 3. In the electrical welding equipment welding contact method; 4. Oxygen - acetylene flame welding. According to the above introduction, we have conducted a variety of tests, only the red furnace welding test successfully. However, the use of this method is inefficient and has poor working conditions and can not be met under mass production conditions. We also study the contact method of welding, as shown