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Current types for Gas Tungsten Arc Welding(GTAW)

Views:172     Author:Site Editor     Publish Time: 2017-08-24      Origin:Site

  When TIG welding, there are three choices of welding current. They are: Direct Current Straight Polarity(DCSP), Direct Current Reverse Polarity (DCRP), and Alternating Current with or without High Frequencystabilization (ACHF). Each of these has its applications, advantages, and disadvantages. A look at each type and its uses will help the operator select the best current type for the job. The type of current used will have a great effect on the penetration pattern as well as the bead configuration. The diagrams below show arc characteristics of each current polarity type.

  TIG welding DCSP

  Direct Current Straight Polarity produces deep penetration by concentrating heat in the joint area.No cleaning action occurs with this polarit.

  TIG welding DCRP

  Direct Current Reverse Polarity produces the best cleaning action as the argon ions flowing towards the work strike with sufficient force to break up oxides on the surface.

  TIG welding with ACHF

  Alternating Current High Frequency combines the weld penetration on the negative half cycle with the cleaning action of the positive half cycle. High frequency re-establishes the arc which breaks each half cycle on transformer based machines.

  DCSP mainly used in welding Stainless Steel, Mild Steel, Nickel, Copper, Titanium

  ACHF mainly used in welding Aluminum, Magnesium

  DCRP mainly used in welding Thin Material

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