Welding method of laser brazing of X 80 pipeline steel

[0012] (1) Welding design: the cross-section of the pipeline steel weldment is as follows: image 3 As shown, according to the thickness of X80 pipeline steel and welding requirements, the V-shaped weld is used to fill the brazing filler metal. In order to ensure the welding, hard brazing filler metal is used. The material is silver-based brazing filler metal. The brazing flux is KBF4 type brazing flux. , the maximum power used is 10kW; in order to determine the specific process parameters, a test welding is carried out, and the schematic diagram of the test welding is as follows figure 2 As shown, firstly, the pre-welding treatment of the test welding sample is carried out, the wedge angle is adjusted to zero, the laser power output value is adjusted, and the speed of 1m / min is preheated, and the temperature of the inner wall of the test welding sample is measured by the thermal sensor at the inner wall of the pipeline steel. , so that the temperature of the inner wall reach...