FranFlangeIt is also called a flange plate or flange. A flange is a component that connects pipes to each other and is attached to the end of a pipe. There are holes on the flange, and bolts are used to tightly connect the two flanges. The flanges are sealed with gaskets. Flanges are divided into threaded connection (threaded connection) flanges and welded flanges.
1To prevent intergranular corrosion caused by the heating of the flange cover, the welding current for electric welding should not be too large, and it should be less than that for carbon steel electrodes20%The upper and lower electric arcs should not be too long. The hollow beam should be cooled quickly, and narrow welds are preferred.
2When using the welding wire, it should be kept dry. For titanium-calcium type, it should be treated150℃Dryness1Hour, lowaHydrogen type reaction200-250℃Dryness1Hours(It cannot be air-dried repeatedly; otherwise, the welding core is very likely to crack and fall off)Avoid oil and dirt on the welding wire and core to prevent an increase in carbon content during welding and damage to the quality of the welded parts.
3When stainless steel plate high-pressure pipe fittings are welded by electric welding, they are repeatedly heated to dissolve the cementite, reducing their corrosion resistance and physical properties.
4The hardened American standard flange cover of the high-pressure pipe fittings made of chromium stainless steel plate after welding is very large and is very prone to cracking. If the same type of chromium stainless steel electrode is selected(G202,G207)Electric welding must be carried out300℃Heating on both sides and after welding700℃Slow cooling violence up and down. If the welded parts cannot undergo post-weld quenching and tempering treatment, stainless steel plate high-pressure pipe fitting welding wire should be used(A107,A207).
5The stainless steel flange cover has moderately enhanced the appropriate reliability elements to improve its corrosion resistance compared to electric welding weldabilityTi,Nb,MoThe weldability of electric welding is better than that of chromium stainless steel flanges. Select the same type of chromium stainless steel flange welding wire(G302,G307)At that time, it should be carried out200℃Heating on both sides and after welding800℃The quenching solution for both the upper and lower parts. If the welded parts cannot undergo quenching and tempering treatment, stainless steel high-pressure pipe fitting welding wire should be used(A107,A207).6Stainless steel plate high-pressure pipe fittings butt-weld flange welding wires have excellent corrosion resistance and oxidation resistance, and are widely used in chemical plants, organic fertilizers, crude oil, medical equipment manufacturing, etc.
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The company uses high-quality stainless steel and exquisite craftsmanship to ensure there are no weld marks at the interfaces. Its products feature novel designs, elegant craftsmanship, and long-lasting durability. The company has always adhered to the principle of quality first and reputation first. It is equipped with mature production facilities and has strong technical strength, thus ensuring the quality of its products. The company is willing to make unremitting efforts to join hands with our customers to create a win-win situation and provide high-quality products for our partners.
