Why must the tip of the tungsten be hot

Gas tungsten arc welding

why must the tip of the tungsten be hot

Tig Welding Penetration & Tungsten Electrode Grind Angle

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A favorite tungsten electrode analogy is that you may have the best welding equipment in the world, but without properly prepared tungsten electrodes to transfer the arc, your welding application is like driving a Porsche on its rims. The tungsten electrode is one of the most important, and yet one of the most frequently overlooked, process variables in DC arc welding. Selecting and preparing them for welding involves three critical areas:. The complete electrode geometry for DC welding comprises the electrode diameter, the included angle taper , and the tip flat see Figure 1. The choice of geometry will always affect electrode life, arc starting, weld penetration, and arc shape. Regardless of the geometry selected, the electrode configuration must be tested during welding procedure development.

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This specification is intended to assist welders in selecting and preparing one of the most important and frequently overlooked welding process variables: the tungsten electrode. Welders can spend thousands of dollars on welding equipment, but if they do not select and prepare their electrodes with this less expensive process component properly, then their welding results can be poor, inconsistent, or problematic. This guide will help eliminate this variable as a concern in your welding and make it an asset. The section of this booklet that describes the proper electrode grinding techniques is dedicated almost entirely to direct current welding, since electrodes for alternating current welding are usually balled and not ground. Typically, to initiate the arc, high voltage is used to break down and ionize the shielding gas between the electrode and the work piece. Current is then transferred from the electrode to the work to create an electric arc. The tungsten electrode serves as the terminal for the electric arc and fuses together either with or without filler material.

The process uses a non-consumable tungsten electrode that delivers the current to the welding arc. The tungsten and weld puddle are protected and cooled with an inert gas, typically argon. TIG welding is similar to oxy-acetylene welding in that you use a filler material for build-up or reinforcement. In race car fabrication , we use TIG welding for aluminum and chrome-moly steel. If you are going to weld either of these materials, you need a quality TIG welder. Miller offers products to accommodate anyone from a home hobbyist to an advanced user. If you have ever welded with an oxy-acetylene torch, you can easily weld with a TIG machine.

Gas tungsten arc welding GTAW , also known as tungsten inert gas TIG welding , is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. The weld area and electrode is protected from oxidation or other atmospheric contamination by an inert shielding gas argon or helium , and a filler metal is normally used, though some welds, known as autogenous welds, do not require it. When helium is used, this is known as heliarc welding. A constant-current welding power supply produces electrical energy, which is conducted across the arc through a column of highly ionized gas and metal vapors known as a plasma. GTAW is most commonly used to weld thin sections of stainless steel and non-ferrous metals such as aluminum , magnesium , and copper alloys.

Tungsten Electrode Guidebook

TIG welding mistakes and solutions. The TIG process is complex, and it is undisputedly the most difficult process to learn.

How a TIG Welder Works and When to TIG Weld

Different tip angle of non-consumable tungsten electrode are used as per the application in GTAW process. Ever wondered what will be its effect on bead profile and penetration??? Electrode Tip angle varies from 15 o to o. Narrow angle and Wider angle will effect on bead width, Arc starting, current carrying capacity, arc stability, weld penetration and electrode life. Sharper Electrode Narrow angle : Wider weld bead, Easier arc striking, less amperage, improved arc stability, less weld penetration, shorter electrode life. Blunter Electrode Wider angle : Narrower weld bead, harder arc striking, more amperage, increased potential for arc wander, better weld penetration, longer electrode life.


Effect of Tip angle of Tungsten electrode and proper grinding techniques GTAW




Start studying Chapter 15 Gas Tungsten Arc Welding. Learn vocabulary, terms, and Why must the tip of the tungsten be hot? it will stabilize the arc to melt the.
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