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What are the quality effects during the operation of the high-frequency welded pipe machine
Release time:
2022-11-01 10:05
high frequency welded pipe machineThe influence of operation on welding quality in production includes the following items:
The welding speed of the high-frequency welded pipe machine is also one of the main parameters of the welding process, which is related to the heating system, the welding deformation speed and the mutual crystallization speed. In high-frequency pipeline welding, the welding quality improves with the increase of welding speed. This is because the shortening of the heating time reduces the width of the edge heating zone and shortens the time for forming the metal oxide. If the welding speed is reduced, not only the heating zone becomes wider, but the width of the melting zone will also change with the change of the input heat, resulting in a larger internal burr. In low-speed welding, less heat input makes welding difficult. If the specified value is not met, defects may occur. Therefore, when welding high-frequency pipelines, the appropriate welding speed should be selected according to different specifications and varieties at the speed allowed by the mechanical equipment and welding device of the unit.
The opening angle of the high-frequency welded pipe machine refers to the angle between the two edges of the tube blank in front of the squeezing roller. The size of the open angle is related to the stability of the combustion process and has a great influence on the welding quality. When the opening angle is reduced, the distance between the edges is also reduced, thereby enhancing the proximity effect. Under the same other conditions, the heating temperature of the edge can be increased, thereby increasing the welding speed. If the opening angle is too small, the distance from the joint point to the center line of the squeeze roller will be extended, which will cause the edge to not be squeezed at high temperatures, thereby reducing welding quality and increasing power consumption. Actual production experience shows that the opening angle can be adjusted by moving the longitudinal position of the guide roller, usually between 2 ° and 6 °. If the guide roller cannot be adjusted longitudinally, the opening angle can be adjusted by the thickness of the guide ring or by pressing the closing bead.
The position of the inductor of the high-frequency pipe welding machine has a great influence on the welding quality. When far away from the center line of the squeeze roll, the effective heating time is long and the heat affected zone is wide, which reduces the welding strength; on the contrary, insufficient edge heating will also reduce the welding strength. The inductor shall be concentric with the pipe and the distance between the tip of the inductor and the centerline of the squeeze roll shall be approximately equal to or less than the pipe diameter (1.5 times the pipe diameter for small pipes).
High frequency welded pipe machine
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