From Tungsten Electrode to GTAW QualityⅠ

The article is one part of GTAW quality on tungsten electrode, for example, the maximum weld quality should be assured by means of maintaining cleanliness.

Because gas tungsten arc welding affords greater control over the weld area than other welding processes, so it can produce high-quality welds when operated by skilled operators. Maximum weld quality is assured by maintaining cleanliness—all equipment and materials used must be free from oil, moisture, dirt and other impurities, as these cause weld porosity and consequently a decrease in weld strength and quality. To remove oil and grease, alcohol or similar commercial solvents may be used, while a stainless steel wire brush or chemical process can remove oxides from the surfaces of metals like aluminum. Rust on steels can be removed by first grit blasting the surface and then using a wire brush to remove any embedded grit. These steps are especially important when negative polarity direct current is used, because such a power supply provides no cleaning during the welding process, unlike positive polarity direct current or alternating current. To maintain a clean weld pool during welding, the shielding gas flow should be sufficient and consistent so that the gas covers the weld and blocks impurities in the atmosphere. GTAW in windy or drafty environments will increase the amount of shielding gas necessary to protect the weld, and which will increase the cost and making the process unpopular outdoors. 

 

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