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One of the chief problems of TIG welding is porosity. Porosity may be described as gas pockets formed in a metal weld. The reason for porosity may be due to improper coverage of shielding gas, the use of inappropriate shielding gas or filler metal, too much heat and a base material that is not cleaned properly.







The appropriate filter rod should be selected for the base material. Use argon gas shielding and not CO2. This will also prevent porosity. TIG welding is best performed using argon gas instead of a gas mixture or carbon dioxide.







Excess heat can also cause porosity. You have to remove dirt, grease and surface oxides from the surface of the material using a stainless steel brush to avoid porosity.





Lack of fusion is another major problem that can occur in TIG welding. If the weld does not join with the base material then it will lead to a weak joint. Experts suggest that to have the best TIG weld, you should use 10 amps for every thousandth of an inch of material.







Undercutting is yet another common problem with TIG welding. This happens when a groove is made along the edge of the weld and then you fail to fill the place with weld metal.








Here are some more useful tips to prevent possible problems in TIG welding:



1. Know the right use of an air-cooled / water-cooled torch



2. Learn the proper procedure for cleaning base metals



3. Know the occasions when you should use gas lens 



4. Find out the causes porosity in a GTAW bead, and learn how to prevent it



5. Know the types of tungsten you should use




6. Know the causes of an unstable arc and learn to remedy them 



7. Find out all about excessive electrode consumption 



8. Learn to prevent tungsten contamination and discoloration



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