Welding seam opening angle of high frequency welded pipe

The opening angle usually varies between 4 and 7°. The size of the opening angle is related to the stability of the firing process. It has a great influence on the welding quality. Reducing the opening angle can strengthen the proximity effect, increase the heating temperature of the edge, and improve the welding quality. Welding speed, but the opening angle should not be too small. If the opening angle is too small, the distance from the meeting point to the center line of the squeeze roller will be lengthened, which will cause the edges to be squeezed side by side at the highest temperature and reduce the welding quality. When the opening angle is too small, due to the excessive formation of liquid, it moves to the welding point under the action of magnetic lines of force (the density of magnetic lines of force at the V-shaped angle is the largest) and gathers into large excess explosions to form deep pits that are difficult to press, which affects welding. Quality: If the opening angle is too large, the proximity effect is reduced, the welding speed is reduced, and the power consumption is increased.

The distance from the center line of the squeeze roller to the inductor is the length of the opening angle. The length of the opening angle will increase the resistance of the weld and reduce the effective value of the current. Therefore, without affecting the welding quality, the length of the opening angle should be based on different specifications. make adjustments.