High frequency welder using a unique high-frequency current skin effect and proximity effect, gathered in the welding current at the contact surface, the surface bonding surface temperature rises rapidly, it will be heated to melt solder surface or near-molten plastic state then quickly squeezed into a pressure welding method for joints. This welding method has a number of advantages: the weld heat affected zone of small, fast heating, which can greatly increase the speed and frequency welder weld quality, and available without pickling, shot peening and trimming strip for the blank , while welding high alloy steels and non-ferrous metal pipe, greatly reduce the unit power consumption. We can produce all kinds of metal pipe with a set of welding equipment. Different metals, simply changing the corresponding welding speed and welding power.
Depending on the current frequency, high frequency welding machine can be divided into radio frequency current welding and high frequency induction welding, soldering IF current three.
Depending on the method of high-frequency current lead tube, high-frequency welding machine can be divided into high-frequency and high-frequency induction welding contact pads in two forms. Offs between the two welding methods are as follows:
Advantages of high-frequency welding machine are:
1) Invalid shunt less;
2) Due to squeeze stick close contact head, high current density, high efficiency;
3) Small heat affected area;
4) The impact of small diameter, can be welded about 8 to 1270 mm diameter tube;
5) Welding speed of up to 100 to 120 m / min, such a high welding speed and groove so that the molten metal layer may not be able to protect the welding light alloy, stainless steel, copper, brass, zirconium and other metal pipe.
The disadvantages are:
1) Consumption contact head;
2) There is galvanic corrosion defects;
3) Heating range of small, rapidly melted, detrimental to the tube surface.
The advantages and disadvantages of induction welding opposite to the above, in particular the impact of large diameter. In the production practice, usually choose induction welding method. This is due to induction welding contact welding compared with the following significant advantages:
1) Virtually eliminating equipment failure caused by the open, thus increasing equipment utilization and reduce production costs;
2) Stable welding process, welding quality, smooth weld surface;
3) The strip joints and surface quality strict requirements, so as to reduce the labor intensity;
4) Due to the non-electrode pressure, ideal for welding thin-walled tube;
5) No contact electrode consumption, thus saving non-ferrous metals, and saving downtime caused by the replacement electrode;
6) Welding adjustment easy and convenient. However, when the ratio of induction welding contact pads 40 to 50% high power required for the desired power. When the power and welding pipe welding device specifications are the same, induction welding speed of the contact welding speed of 1/2 to 2/3.
