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A C, with high frequency superimposed, when welding Aluminum. D C straight polarity on almost everything else.
High frequency stabilized alternating current power supply is the most used GTAW process for aluminum with pure tungsten electrodes.
Tgs 50
Manual Metal Arc Welding(MMAW) Also GTAW (TIG) and GMAW (MIG) The MIG wire carries electric current so it is considered the electrode. TIG the Tungsten is considered an electrode.
It depends on what welding process is being used and what type of metal is being welded. When Oxy-Fuel Welding, Acetylene is the most popular. MAPP gas and Propane are also used. With the GMAW (MIG) process Argon, CO2 and Oxygen gasses, in mixtures or alone, are used. GTAW (TIG) gasses are almost always Argon and/or Helium. This is not all inclusive as new processes are being developed every day. Check with your welding material supplier for relevant info.
For TIG - GTAW "heliarc" welding Argon replaced Helium because it is #1 cheaper #2 heavier so coverage is better (stays around the weld area).
What type of welding can we use LPG ?
It depends on the type of stainless steel. Stainless steels come in various compositions and are identified by numbers and letters. Electrodes should be chosen that match these. For example when welding 316 stainless use type 316 electrodes. In a lot of situations you can safely use the next higher number. 304 stainless can be welded with 308 electrodes, 308 stainless with 310 electrodes. 309 electrodes are generally used to weld stainless to carbon steel.
Heliarc was the name used when TIG welding was first developed during WWII. A tungsten electrode carrying the current to create an arc and utilizing helium as a protective gas. The process has evolved to utilize many different types of gasses. The name was changed to reflect this. The correct nomenclature is GTAW. Gas Tungsten Arc Welding.
for welding dingeberries
The only way to tig is to have your ground clamp hooked to the positive side of the welding machine. The negative lead will go to the tig torch. If it is reversed you will find out very quickly when you strike an arc. Most metals will be welded using this Polarity (straight). Most Aluminum TIG welding is performed using A C current.
welding rod is used without applying current through it while the other one is, current is passing thru it..i.e. Welding rods are used in TIG welding process while Electrodes (E6011, E6013, E7017..etc..) is used in SMAW process