工厂中经常需要使用多种规格的加长钻头。以前采用的方法是将钻头尾部加工成凸台,插入接长杆的凹槽内,以黄铜为钎料进行氧乙炔钎焊。此法的缺点是接头强度低,并且凸台、凹槽加工困难。此外,也曾采用08Mn2Si焊丝气焊接长,但焊后接头及热影响区淬硬倾向严重,易产生裂纹,废品率高,而且变形大,校直困难。特别是φ3毫米以下的钻头,因氧化严重,几乎不能很好成型。因此,小直径钻头的接长仍是生产中未解决的难题。采用氧乙炔喷熔法接长钻头,主要是利用 Factories often need to use a variety of extended drill bits. The method used before is to process the tail of the drill into a boss, insert the groove into the long rod, and braze the oxyacetylene with the brazing filler metal. The disadvantage of this method is that the joint strength is low, and the boss and the groove are difficult to process. In addition, 08Mn2Si gas welding has been used long, but after welding joints and heat-affected zone harden tend to be serious, easy to produce cracks, high rejection rate, but also large deformation, straightening difficulties. In particular, φ3 mm below the drill, due to serious oxidation, almost not well shaped. Therefore, the small diameter drill bit long is still the production of unsolved problems. Oxyacetylene spray welding method with a long drill, the main use