The essentials of quality control of hf welders:
There are many factors that affect the quality of hf welders
, and these factors interact and restrict in the same system. When one factor changes, other factors change with it. Therefore, when you adjust the high frequency, it is not enough to just pay attention to the local adjustment of the frequency, power, current or extrusion amount of the high frequency welder. This adjustment must be based on the specific conditions of the entire molding system. Considering it from the high frequency welding associated with all comprehensive aspects, adjust by eliminating all the influencing factors one by one.
This frequency refers to the high frequency of hf welders machine in the welding process. The frequency of hf welders has a great impact on welding and quality, because high-frequency frequency affects the distribution of current in the raw material.
2. Welding method
There are two ways of high frequency welding: contact welding and induction welding.
Contact welding is that a pair of copper electrodes are in contact with both sides of the raw material being welded. The penetration of induced current is good and the two effects of high frequency current (proximity effect & skin effect) are best utilized by direct contact between copper electrode and steel plate. Therefore, the welding efficiency of contact welding is high and the power consumption is low. It is widely used in the production of high-speed and low-precision pipe. In the production of particularly thick welded pipes, contact welding is generally required.
Induction welding is that one or more turns of induction wire snares cover outside the welded steel tube. The effect of multiple turns is better than that of single turns.
In the use of induction welding, the efficiency is high when the distance between the induction coil and the steel tube surface is small. But it is easy to cause the discharge between the induction coil and the tube. At the same time, if the molding is irregular, too small clearance is easy to scratch the induction coil. Generally, the gap between the induction coil and the surface of the steel tube should be kept 5~8mm.
When you use induction welding, the induction coil is not in contact with the steel plate, so there is no wear. Its induced current is stable, which ensures the stability of welding seam. The surface quality of the welded steel tube is good and the welding seam is smooth.