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In Gas tungsten arc welding (GTAW) which of the following polarity is generally used for getting higher penetration
1. Direct current straight polarity (DCSP)
2. Direct current reverse polarity (DCRP)
3. Alternating Current high frequency (ACHF)
4. All of the above

1 Answer

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Correct Answer - Option 1 : Direct current straight polarity (DCSP)

Explanation:

Straight polarity: Here electrode is negative and the workpiece is positive and the circuit is between the two. So the electrons move from electrode to workpiece with high velocity. Heat energy is created and generated at the workpiece surface and transfers to surrounding i.e electrode.

  • In straight polarity 2/3 of heat will be at the workpiece and 1/3 will be at the electrode.
  • So more heat is concentrated on the workpiece results in more penetration and less weld width.
  • Due to lower heat generation at the electrode end, the melting rate of the electrode reduces causing a low deposition rate.

Reverse polarity: Here the whole scenario is opposite, electrons move from workpiece to electrode resulting in 2/3 heat at electrode and 1/3 at the workpiece. So resulting in less penetration and more weld width.

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