Flanges are disk-shaped parts, the most common in pipeline engineering, flanges are used in pairs and with matching flanges on valves. In pipeline engineering, flanges are mainly used for pipeline connection. In the need to connect the pipe, a variety of mounting flanges, low pressure pipes can use wire flanges, more than 4 kg of pressure using welded flanges. Put a gasket between the two flanges and fasten them with bolts. Different pressure flanges have different thicknesses and use different bolts. The stainless steel flange refers to the production of stainless steel flange parts.
1, stainless steel flange in welding, subject to repeated heating precipitation carbide, will reduce the corrosion resistance and mechanical properties of stainless steel flange.
2, stainless steel flanges should be kept dry when used, titanium calcium type should be dried at 150℃ for 1 hour, low a hydrogen type should be dried at 200-250℃ for 1 hour (can not be repeated drying, otherwise the coating is easy to crack and peel), to prevent the electrode coating sticky oil and other dirt, so as not to increase the carbon content of the weld and affect the quality of stainless steel flanges.
3, chromium stainless steel flange after welding hardening of the United States standard flange is large, easy to crack, if the same type of chromium stainless steel welding rod (G202, G207), must be preheated above 300℃ and after welding about 700℃ slow cooling treatment, if the welding can not be post-welding heat treatment, Stainless steel flange welding rod (A107, A207) should be selected.
4, stainless steel flange, in order to improve corrosion resistance and weldability and appropriate increase the appropriate amount of stability elements Ti, Nb, Mo, etc., weldability is better than chromium stainless steel flange, using the same type of chromium stainless steel flange electrode (G302, G307), should be preheated above 200℃ and about 800℃ after welding tempering treatment, if the weldment can not be heat treatment, Stainless steel flange welding rod (A107, A207) should be selected.
5, in order to prevent the corrosion between the eyes due to the heating of the stainless steel flange cover, the welding current should not be too large, about 20% less than the carbon steel electrode, the arc should not be too long, the layer is fast cold, and the narrow welding pass is appropriate.
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