If you're using an inverter—based machine, use 2 percent thoriated tungsten ground to a point. Email Frank Armao. Read more from this issue.
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Inverter-based welders let operators adjust the welding output frequency not to be confused with high frequency for arc starting from 20 up to hertz in the case of the advanced Dynasty models.
The output frequency of conventional welders is fixed at 60 hertz. The lower frequency range produces a broader arc cone, widening the bead profile, which is great for build-up work. Increasing the frequency, particularly above hertz, produces a tighter, more focused arc cone. This pinpoint control drives more heat into the weldment for better penetration and a narrower bead, which helps when welding in corners, on root passes and fillet welds, or anywhere precision welding is required.
An AC TIG inverter is ideal for welding aluminum because it allows welders to fine-tune the weld bead profile by controlling arc cone shape and arc force through increased balance and frequency control. This lets operators change the shape and force of the welding current from a wide fan to a more focused stream. To achieve a softer, wider arc, welders can back off the AC frequency. For a more forceful arc, welders can tighten the frequency. The net effect is that advanced squarewave technology provides better control of the bead profile.
While pure tungsten traditionally holds up to heat better because it rounds off instead of forming small nodules, it's not the perfect answer for AC TIG welding anymore.
The characteristics of pure tungsten combined with AC mode welding results in the tungsten balling up, producing a wider arc cone and possible arc wandering. Tube and Pipe Fabrication. Tube and Pipe Production. Waterjet Cutting. Buyers' Guides. Digital Edition. Our Publications. About the Author. Frank Armao President. About the Publication. Related Companies Lincoln Electric Co. Aluminum Workshop: Choosing aluminum alloys for welded fabrications. Aluminum Workshop: Choosing an aluminum alloy.
Trade Showcase. This Week's Trending Articles 1. What color tungsten is best for aluminum? Category: business and finance large business. The following electrodes can be used for TIG welding aluminum, but there are a few rules and caveats that will need to be discussed below:.
What size tungsten should I use? Tig Welding Guide. What is purple tip tungsten for? What is gray tungsten used for? Ceriated Grey. How dangerous is thoriated tungsten? What kind of tungsten is purple? Re: Purple tungsten. What color tungsten to use? Pure Tungsten Color Code: Green.
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