Key points of stainless steel elbow manufacture

　　1. The welding rod should be kept dry when used. The titanium-calcium type should be dried for 1 hour at 150 C. The low hydrogen type should be dried for 1 hour at 200-250 C. (The skin can not be repeatedly dried, otherwise it is easy to crack and peel off). The sticky oil and other dirt of the welding rod skin should be prevented, so as to avoid increasing the carbon content of the weld and affecting the quality of the weld. When the Custom Pipe Fitting Stainless Steel Elbow is welded, carbides are repeatedly heated to reduce corrosion resistance and mechanical properties. After hardening, the cracks are easy to produce. Macro gold is good. The mechanical properties of the weld seam have been tested. If the same type of electrode is used for welding, it must be preheated above 300 C and slowly cooled around 700 C after welding. If the weldment cannot be heat treated after welding, chromium nickel stainless steel elbow should be used.

　　2. In order to improve the corrosion resistance and weldability of stainless steel elbows, appropriate addition of stability elements Ti, Nb, Mo, etc. can make the weldability better. When using the same type of chromium stainless steel elbow, preheating above 200 C and tempering around 800 C after welding should be carried out. If the weldment cannot be heat-treated, chrome nickel stainless steel electrode should be used. In order to achieve the expected mechanical function.

　　Quenching and tempering treatment: high temperature tempering heat treatment method is called quenching and tempering treatment. Tempering at high temperature means tempering at - C. Quenching and tempering can make steel function.

　　Cold bending and hot bending: In general, small and medium diameter elbows can be processed by cold bending; most large tubes (especially large diameter) can be made by hot bending.