Stainless steel flange is a kind of disc parts, are the most common in the pipeline engineering, stainless steel flange are in pairs, and the valve on the use of form a complete set of stainless steel flange. In pipeline engineering, stainless steel flange is mainly used for pipe connection. In need of connecting pipes and all kinds of installation of a stainless steel flange, low pressure pipe can use wire stainless steel flange, the use of more than 4 kg pressure welding of stainless steel flange. Between the two pieces of stainless steel flange and gasket, and then use bolts. Stainless steel flange have different thickness and different pressure with different bolt.
Using the matters needing attention
1, in order to prevent the result of the stainless steel flange cover heat corrosion between eyes, welding current shoulds not be too big, is about 20% less than that of carbon steel electrode, arc shoulds not be too long, the interlayer cold quickly, with narrow bead advisable.
2, electrode should be kept dry, when using titanium calcium type should be 1 hour after 150 ℃ drying, low hydrogen type a should be 1 hour after the 200-250 ℃ drying (can't repeat drying, otherwise coated easy cracking flake), to prevent the covering viscous oil and other dirt, lest cause weld increased carbon content and affects the quality of weldment.
3, stainless steel flange pipe fittings, when welding the carbide precipitation by repeated heating, reduce corrosion resistance and mechanical properties.
4, chromium stainless steel flange pipe fittings sclerosing beauty standard stainless steel flange after welding is bigger, is easy to crack. If using the same type of chromium stainless steel electrode (G202, G207) welding, must be above 300 ℃ preheat and 700 ℃ or so slow cooling after welding. If cannot undertake the weldment heat treatment after welding, it should choose stainless steel flange pipe fittings electrode (A107, A207).
5, stainless steel flange, in order to improve the corrosion resistance and weldability and increasing stability element Ti, Nb, Mo and so on, some good weldability is chromium stainless steel flange. Using the same type of chromium stainless steel flange welding electrode (G302, G307), should be above 200 ℃ preheat and around 800 ℃ tempering treatment after welding. If cannot undertake the weldment heat treatment, should choose stainless steel flange pipe fittings electrode (A107, A207).
6, stainless steel flange pipes, stainless steel butt welding flange welding rod has good corrosion resistance and oxidation resistance, widely used in chemical, chemical fertilizer, oil, medicine, machinery manufacturing.
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