It is an Arc welding process where in coalescence is produced by heating the job with an electric arc strews between a tungsten electrode and the job. A shielding gas is used to avoid atmosphere contamination of the molten weld pool. In this process welding current, water, inert gas supply is turned on. The Arc is struck either touching the electrode with a scrap metal tungsten piece or using a high frequency unit. The arc is struck between the electrode and the job. The spark jumps across the air gap between the electrode and the job.
No flux is used, hence there is no danger of flux entrapment when welding refrigerator & air conditioner component. Clear visibility of the arc and the job, the operator can exercise a better control on the welding process. TIG welding is very much suitable for high quality welding of thin material It is a very good process for welding non-ferrous metals and stainless steel.