45° Welding Elbow National Standard Carbon Steel Elbow Stamping Elbow Seamless Welding Elbow

45° Welding Elbow National Standard Carbon Steel Elbow Stamping Elbow Seamless Welding Elbow Φ 22 - Φ 165 Φ 57*5

Stainless steel elbow
1, electrode should be kept dry when used, titanium calcium type should be dried by 150℃ for 1 hour, low hydrogen type should be dried by 200-250℃ for 1 hour (not repeated drying, otherwise the skin is easy to crack and peel off), to prevent electrode skin sticking oil and other dirt, so as not to increase the carbon content of the weld and affect the quality of welding parts. During welding, carbide is precipitated by repeated heating, which reduces corrosion resistance and mechanical properties. After welding, it is easy to crack. If using the same type of electrode welding, must be more than 300℃ preheating and after welding about 700℃ slow cooling treatment. If the welding parts can not be post-welding heat treatment, should be used chrome nickel stainless steel electrode.
2, in order to improve the corrosion resistance and weldability of stainless steel elbow and increase the stability of elements Ti, Nb, Mo, welding is better, the use of the same type of chromium stainless steel electrode, should be more than 200℃ preheating and welding about 800℃ after tempering. If the weldment can not be heat treated, chromium nickel stainless steel electrode should be used.