AWS E308-16 Fimbo za Kuchomelea za Chuma cha pua za Universal 2.5mm-5.0mm

The stainless steel electrode use notice

1. chromium stainless steel has certain corrosion resistance (oxidizing acid, organic acid, cavitation) , heat resistance and wear resistance. Usually used in power plants, chemical, petroleum and other equipment materials. Chromium stainless steel poor weldability, should pay attention to the welding process, heat treatment conditions and the selection of appropriate electrode.

2. CR-13 stainless steel has higher hardness after welding and is easy to produce crack. If the same type of chromium stainless steel electrode (G202, G207) is used for welding, it must be preheated above 300 ° C and cooled about 700 ° C after welding. If the welding can not be carried out post-weld heat treatment, then the choice of chromium-nickel stainless steel electrode (A107, A207) .

3. Chromium 17 stainless steel, in order to improve the corrosion resistance and weldability and increase the appropriate amount of stability elements such as Ti, Nb, Mo, etc. , weldability is better than chromium 13 stainless steel. When the same type of chromium stainless steel electrode (G302, G307) is used, it should be preheated above 200 ° C and tempered around 800 ° C after welding. If the welding can not be heat-treated, then the choice of chromium-nickel stainless steel electrode (A107, A207) . CR-NI stainless steel electrode has good corrosion resistance and oxidation resistance, widely used in chemical industry, fertilizer, petroleum, medical machinery manufacturing.

4. 0 and below can be used for all-position welding.

5. 0 and above for flat welding and fillet welding.

6. Chromium-nickel stainless steel coating has titanium-calcium type and low hydrogen type. Calcium titanate type can be used in AC and DC, but the penetration of shallow AC welding, while easy to red, so as to use DC power supply. Diameter

7. The electrode should be kept dry, the titanium-calcium type should be dried at 150 ° C for 1 hour, and the low hydrogen type should be dried at 200 ° C to 250 ° C for 1 hour (no repeated drying, otherwise the coating is easy to crack and peel off) , prevent the electrode coating sticking oil and other dirt, so as not to increase the carbon content of the weld and affect the quality of the welding.

8. In order to prevent the corrosion between the eyes caused by heating, the welding current should not be too large, less than carbon steel electrode about 20% , ARC should not be too long, quick cooling between layers, to narrow bead is appropriate.