Welding current
In the multi -wire buried arc welding of straight seam welded pipes, the welding current of all wires increases, the remaining height of the weld will increase, but the degree of increase in different welding wires will be different. Generally, the welding current of the first welding wire is the largest among all welded wires. Its change will cause a large high change compared to other welding wires, and the middle welding wire is stronger than the last trace. Similarly, the first welding wire welding current has the most impact on the depth of the welding seam. The middle welding wire is relatively small as the melting depth of the welding seam filling, and the last welding wire has almost no effect on this. This has also seen relevant reports on the automation forum. Therefore, when preparing the multi -buried arc welding process, it should be the largest welding current of the first welding wire, the middle order, and the last one.
Arc voltage
In the multi -wire buried arc welding of straight seam welded pipes, the voltage of all wires has a certain impact on the height of the weld and the width of the width. Too low will make it unable to form a smooth transition.
Since the voltage of the arc voltage is basically proportional to the weld width, that is, the curved arc voltage determines the width of the melting tank. If the rear wire arc voltage is less than the front wire arc voltage, the width of the rear filament tank is less than the width of the front wire melting tank, resulting in the "gourd" type of the melting tank section. Therefore, when preparing the multi -buried arc welding process, the arc voltage of the first welding wire should be the smallest, the middle is in the middle, and the last one is the largest.
Welding speed
In the multi -wire buried arc welding of straight seam welded pipes, the welding speed has a greater impact on the depth and width of the weld, and the impact of the remaining height is relatively smaller. The faster the speed, the smaller the depth and the width of the melting width. Generally, the welding speed is appropriately improved on the premise of ensuring welding quality to improve the production efficiency of straight welded pipes.
The power supply adopts a hybrid configuration of DC-AC, and the DC is used. The welds are high -alkaline -type welds with fine particles, high melting points, moderate viscosity, and good arc. Welding wires are arranged vertically and straight; equal spacing arrangement; the first welding wire is leaned forward, and the latter welding wire is set to transition to the backward leaning in turn, and the tilt angle is increased in order; Under ensuring the depth depth and selection of the appropriate welding line energy conditions, the welding current decreases accordingly, and the arc voltage increases.
