High-pressure welders are generally divided into two types, one is pressure vessel welder and the other is long-distance pipeline welder. Pressure vessel welder refers to the person engaged in pressure pipeline welding (argon union). According to the process, there are manual arc welding machine and argon arc welding machine for pipeline welding.
Long-distance pipeline welder (Luoyang pipeline welding center welder) is divided into cellulose downward welder, flux-cored downward welder and STT. RND welder according to the welding process of long-distance pipeline.
At the same time, TIG welding is also a kind of high-pressure welding machine, which mainly adopts high-frequency high-pressure arc initiation method or pulse arc initiation method. In these two methods, the tungsten electrode is close to the workpiece, but not in contact, leaving a gap of 2 ~ 5 mm between them. The voltage of these two methods is very high, reaching 2000~3000V V, and the high voltage is used to break through the space between the electrode and the workpiece to form a spark discharge. Under the action of high voltage, a strong electric field is formed in the arc space, which strengthens the ionization of electrons emitted by cathode and arc space, and makes the arc space quickly change from spark discharge or glow discharge to arc discharge.
Due to the high temperature generated during arc discharge, arc discharge can be maintained at a low voltage. Therefore, the arc striking process is completed. When starting an arc, high voltage is needed to break through the arc space, in order to use high frequency or pulse voltage safely.
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