1, chromium stainless steel with a certain degree of corrosion (oxidizing acids, organic acids, cavitation), heat and wear resistance. Commonly used in power plants, chemical, oil and other equipment and materials. Chromium stainless steel is poor, should pay attention to welding, heat treatment conditions and appropriate choice of electrodes.
2, chromium stainless steel after welding, hardening of 13 large, easy to crack. If using the same type of chromium stainless steel electrode (G202, G207) welding, must be more than 300 â„ƒ 700 â„ƒ preheating and after welding so slow cooling treatment. If the weldment can not weld heat treatment, should be chosen chrome-nickel stainless steel electrode (A107, A207).
3, 17 Cr stainless steel, to improve corrosion resistance and increase the amount of Mig Welding Electrode and appropriate elements of Ti, Nb, Mo, etc., welding of stainless steel better than the chrome 13. Using the same type of chromium stainless steel electrode (G302, G307) should be carried out more than 200 â„ƒ 800 â„ƒ preheating and post weld tempering about. If the weldment can not be heat treated chrome-nickel stainless steel welding rod should be used (A107, A207).
4, Cr-Ni stainless steel electrode has good corrosion resistance and oxidation resistance, widely used in chemical, fertilizer, petroleum, medical equipment manufacturing.
5, Cr-Ni stainless steel welding, carbide precipitation by repeated heating and reduce the corrosion resistance and mechanical properties.
6, chrome-nickel stainless steel with titanium calcium type coating and low-hydrogen type. Titanium calcium type can be used for AC and DC, but the exchange of shallow penetration welding, and easy to redness, so as far as possible with DC power supply. Diameter of 4.0 and below can be used for all position welding parts, and above 5.0 for a flat butt and fillet weld.
7, the electrode should be used to keep dry, titanium calcium type should be dried at 150 â„ƒ for 1 hour, low-hydrogen type should be dried by 200-250 â„ƒ for 1 hour (can not be repeated drying, easy to crack or flake coating), to prevent the electrode sticky coating of oil and other dirt, so resulting in increased carbon content, and weld pieces of welding quality.
8, in order to prevent corrosion of heat generated between the eyes, Nickel Welding Electrodes is not too large, less than about 20% of carbon steel electrode, the arc should not be too long, rapid cooling between layers in order to narrow bead suitable.
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