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Flat welding flange pipe fitting use what matters needing attention

Apr 15, 2020

1,In order to avoid the eyeball corrosion caused by the flange pipe cover heating, the welding current should not be too large, less than 20% of the carbon steel electrode, the arc should not be too long, the layer between the rapid cooling, narrow welding path is appropriate. 

2, the use of welding rod should adhere to its dry, titanium and calcium type should adhere to 150℃ dry for 1 hour, low a hydrogen type should adhere to 200-250℃ dry for 1 hour, to avoid the electrode coating oil and other dirty, so as not to cause the weld to add carbon content and affect the quality of welding pieces.

3, flat welding flange pipe fitting pipe fitting welding, under repeated heating and carbon separation, corrosion resistance and the mechanical function of the product.

4, chrome flat welding flange pipe fitting after welding the hardening of the American standard flange pipe fitting is large, easy to crack.If the same type of chromium stainless steel welding rod (G202, G207) welding, for more than 300℃ preheating and welding after about 700℃ slow cooling treatment.If the welds cannot be heat treated after welding, welding rods (A107, A207) for pipe fittings of flat welding flange should be selected.

5, flat welding flange pipe fitting, in order to improve the corrosion resistance and weldability, appropriate amount of stability elements Ti, Nb, Mo, etc., the weldability is better than chromium flat welding flange pipe fitting.When adopting the same type of chromium flat welding welding rod for flange pipe fitting (G302, G307), it shall be preheated above 200℃ and tempered around 800℃ after welding.If the welding part cannot be heat treated, the welding rod (A107, A207) of the pipe fitting of flat welding flange should be selected.

WH-STEEL is a Chinese pipeline equipment manufacturing company, the company is mainly engaged in foreign trade business, the main products are steel pipe, pipe fitting, flange, elbow, pipe cap, tee, etc.It has served more than 100 customers in more than 30 countries.We provide excellent product quality, price concessions, won the customer's praise.Welcome to purchase.


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