What is the Difference Between AC and DC Welding

AC continuously changes polarity, since directional of flow is reversed 120 times per second for common 60 cycle electricity.

v AC Current ideal for:

v Downhand Heavy plate

v Fast fill

v Aluminum TIG Welding with Hi frequency

Carbon arc torch

This welder has two types of AC current

1. Smooth Arc – for general-purpose work

2. Force Arc – for carbon arc, TIG attachments and new fabrication

DC straight Polarity

With DC straight polarity (DCSP), the electrode is negative and the current flows in the opposite direction…electrode to work.

DC Straight Polarity ideal for:

v Hard facing

v Single Carbon Brazing

v Build-up Heavy Deposits

v Stainless Steel TIG Welding

v Cutting Tap. Cuts like 400 Amps.

DC Reverse Polarity

With DC reverse polarity (DCRP) The electrode is positive and the current flows from the work to the electrode.

v DC Reverse Polarity Ideal for:

v Overhead welding

v Vertical welding

v Cast iron welding

v Heavy aluminum

v Rivet welding

v Sheet Metal

v Low Hydrogen Welding

v Arc Bronze Rod

Divyesh Vaghela