长接杆钻头,一般采用堆焊方法把45号钢的接杆焊在高速钢(W18Cr4V)钻头上如图1。校直后磨掉外圆多出部分即可使用。这种方法,焊接处金相组织粗大,强度较低,经常在使用中,钻头断裂在工件内,造成整过工件报废。现在采用黄铜钎焊,经多次生产试验,焊接质量较原焊接有所提高。 Long post drill bit, the general method of surfacing welded steel rod 45 in the high-speed steel (W18Cr4V) bit shown in Figure 1. Straighten out after grinding more than the outer part can be used. This method, the weld microstructure coarse, low strength, often in use, the drill broken in the workpiece, resulting in the entire scrapped parts. Brass brazing is now used, after many production tests, the quality of welding has improved compared with the original welding.