TIG welding selection factors to be considered

1 does not melt during TIG tungsten electrode requirements are: the ability to emit electrons, various tungsten arc characteristics (the ignition and stable arc), current-carrying capacity, the welded metal, welding, weld thickness, temperature And easy to melt burning. 2 Maximum allowable current and the chemical composition of tungsten, diameter, type of current and the current polarity, tungsten extended length of the contact tip and so on. Tungsten loss: (1) normal wear and tear: In normal welding process, tungsten and slow evaporation due to heat loss due to oxidation. Normal wear and tungsten chemical composition, the type and polarity of the power supply related. (2) abnormal loss: mainly occurs in a number of short circuit arc, or tungsten wire and caused by contact with the molten bath (3) arc and arc stability: mainly composed of tungsten work function of the size of the decision, escape Low power is the ability to emit strong electronic, ignition and steady arc stability is good, otherwise poor. (4) Also, consider the source electrode life and price. Usually when welding thick plate required to obtain increased penetration, should be used to this end and high-current DC is connected to the welding current carrying capability should use thorium tungsten or tungsten zirconium; sheet shallow penetration welding requirements, so welding When the electric current should be small, it should be using DC reverse method, but easy to make the electrodes heat, therefore, the electrode should use easy arc, good stability, thorium, cerium tungsten or tungsten. Welding of aluminum, magnesium and their alloys require the use of AC, the degree of damage in this case the electrodes burn time than small DC reverse, can use relatively inexpensive pure tungsten. Huaye Tungsten and molybdenum remind you: TIG tungsten electrode, look Huaye Tungsten.