TIG welding issues
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During a maintenance task, we encountered a problem: the TIG welding sessions kept failing to meet the quality standards. The foreigners suspected that impure argon gas was the cause, and after replacing it with high-purity argon, the welding became successful. What is the purity requirement for argon gas in TIG welding? Is there a big difference between 99.9% and 99.99%?
I think there isn’t much difference between one unit of argon and two units. In TIG welding, argon is used as a shielding gas, primarily to prevent oxidation. Argon is an inert gas, but when it’s used, the inside of the tube isn’t completely filled with argon; other gases are also present. So, I guess there isn’t much difference between the two
The purity of argon directly affects the hardness and toughness of pure titanium welds, and it also has a significant impact on the occurrence of welding cracks. When welding, the argon gas used must be high-purity argon (argon-rich Ar 99.99%), with a dew point below –40°C and a H2O content of less than 0.001 mL/L. There are also many factors to consider when welding, such as the materials to be welded and the choice of welding materials. Take a look at the following: http://bbs.hcbbs.com/viewthread.php?tid=220492
The purity of argon is very important; 99.99% purity is a basic requirement. It is also necessary to ensure that the location of the weld allows for the complete removal of any remaining air in the pipeline, so as to guarantee welding quality. Regarding the welding of titanium materials as mentioned by the moderator, our company uses carbon dioxide gas as the shielding gas. It is important to pay attention to the interpass temperature during welding, and the color of the base material after welding can indicate the quality of the weld
So the gas you use for welding protection is a mixture, right? Was it pre-mixed gas purchased directly? Should I buy gas to mix it myself?
The three 9s seem a bit off!
During welding, groove preparation is very important; if the groove is not properly prepared, the areas where the base material is exposed need to be ground smooth so that the welding quality will be good