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Butt Welding Flange Flaw Detection Treatment
Welding spatter, iron filings, grease and other external impurities should be removed from the moving area of the probe. The flaw detection cousin should be flat and smooth to facilitate the free scanning of the probe. The surface roughness R.<6.3μm should be ground if necessary.
For welds where the excess height is removed, the excess height should be ground to be flush with the adjacent base metal. Welds with remaining height, such as undercuts, large bulges and depressions on the surface of the welds, should be properly ground and smooth transitions should be made so as not to affect the evaluation of the inspection results.
Butt welding flange,Flaw detection treatment
There are four types of polishing methods for dual-phase steel flanges: manual, mechanical, chemical and electrochemical. The corrosion resistance and decoration of the flange can be improved by polishing. The existing stainless steel electropolishing solution still uses phosphoric acid and chromic anhydride. During the polishing and cleaning process, some chromium and phosphorus will be discharged into the waste water. pollution of the environment.
The shielding gas pressure of the butt welding flange is to avoid slight leakage of the butt welding flange. The shielding gas in the furnace should be connected to a certain positive pressure. Assuming that it is hydrogen shielding gas, it is generally required to be above 20kBar.
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No.27 Gangqiang Road,Konggang Economic Zone,Yongxing Street,Longwan District,Wenzhou,China