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Stainless steel pipe welding points and precautions?

Author: ComeFrom: Date:2014-06-28 16:50:25 Hits:918
Important welded stainless steel pipe in the process that need attention and some considerations: 
1, stainless steel pipe welding power vertical external characteristics, DC positive polarity (wire then negative). 
2, generally suitable for welding thin 6mm or less, with the weld appearance, a small amount of welding deformation characteristics. 
3, the protective gas is argon with a purity of 99.99%. When the welding current is 50 ~ 50A, the flow rate of the argon gas 8 ~ 0L/min, when the current is 50 ~ 250A, the argon flow was 2 ~ 5L/min. 
4, the nozzle projecting from the gas tungsten arc length to 4 ~ 5mm, preferably, welding, etc. at the corner where it is poor shielding 2 ~ 3mm, where the grooved depth 5 ~ 6mm, the distance from the nozzle to the working generally not more than 5mm. 
5, in order to prevent weld porosity of welded parts, if any, rust, oil, etc. Be sure to clean up. 
6, the welding arc length, welding ordinary steel, with 2 ~ 4mm better, but when welding stainless steel to ~ 3mm better, long the protective effect is not good. 
7, when the docking base, the bottom of the back to prevent oxidation of the weld, the need to implement the backside gas. 
8, for the protection of argon gas well the weld pool, and ease of welding operation, the center line of tungsten welding of the workpiece should be maintained 80 ~ 85 ° angle, the angle between the filler wire and the workpiece surface should be as small as possible, is generally about 0 °. 
9, windproof and ventilation. Windy place, it should take steps to block network, and in the indoor ventilation should take appropriate measures.
 
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