MIG and TIG Welding

AC/DC TIG Welders – Knowing the Advantages and Disadvantages

9 Nov , 2016  

TIG welding or Gas Tungsten Arc Welding (GTAW) is one of the most demanding techniques among the various welding methods. However, it provides various advantages and is a coveted skill among both professional and amateur welders. Skilled TIG welders can accomplish advanced operations and are always in demand in an ever growing industry. However, TIG welding is not a difficult skill to learn. While professional courses always help, it can also be learnt on one’s own.

Once you are ready to take on your own TIG welding work, you may wonder if you should invest in a regular TIG welder or opt for an AC/DC TIG welder. It helps to know the various advantages and disadvantages of such welders to be able to make an informed decision.

A brief analysis of the advantages and disadvantages of AC/DC TIG welders are mentioned here.


  • The primary draw for TIG welding is the quality, strength, and finesse of the welds. The added advantage of an AC/DC TIG welder is that it extends this asset beyond ferrous metals. An AC/DC TIG welder allows you to weld highly reactive metals like aluminium and magnesium and their alloys.
  • AC/DC TIG welders offer higher control over various parameters like output current. This directly affects important welding parameters like penetration.
  • The AC component also brings further control features like AC balance and high frequency output into the picture. Advanced IGBT based AC/DC TIG welders feature a long list of features for both manual and automatic control. 


  • AC/DC TIG welders do also come with some disadvantages. The primary one is also the major deterrent – cost. AC/DC TIG welders tend to be far more expensive than regular welders.
  • AC/DC TIG welders, especially the entry level models, can cause rectification. This is countered in more advanced models with the high-frequency or square-wave output.

AC/DC TIG welders without manual or automatic AC balance can cause problems when trying to maintain the ratio of penetration and cleaning for welding reactive metals.


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