A chromium stainless steel with corrosion (oxidation acid, organic acids, cavitation), heat and abrasion resistance. Typically used in power plants, chemical, oil and other equipment and materials. Chromium stainless steel welding poor, should pay attention to the welding process, heat treatment conditions and selection of suitable welding. 2, chrome 13 stainless steel welding, hardening of large, prone to crack. The use of the same type of chromium stainless steel electrode (G202, G207) welding, preheat and post weld more than 300 â„ƒ, 700 â„ƒ about slow cooling processing. Weldment can not weld heat treatment, you should make use of chrome-nickel stainless steel electrode. 3 17 stainless steel, chrome, to improve corrosion resistance and weldability appropriate increase in the amount of stability elements of Ti, Nb, Mo,Welding Wirebetter than the chrome 13 stainless steel. Using the same type of chromium stainless steel electrode (G302, G307) should be carried out more than 200 â„ƒ preheat and post weld tempering around 800 â„ƒ. Weldment can not be heat treated, chrome-nickel stainless steel electrode should be selected.4, chrome-nickel stainless steel electrode has good corrosion resistance and oxidation resistance, widely used in chemical, fertilizer, petroleum, medical machinery manufacturing.5, chrome-nickel stainless steel welded carbide precipitation by repeated heating and reduce the corrosion resistance and mechanical properties.6, drug skin of chrome-nickel stainless steel with titanium calcium type and low-hydrogen type. Titanium calcium type can be used for AC-DC, AC welding penetration is shallow, 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 Electrodeof 5.0 and above for flat butt and fillet weld.7, the electrode should be used to keep dry, lime-titania type shall be approved by the dry one hour of 150 ° C, low hydrogen type should be dried by 200-250 ° C 1 hour (can not be repeated drying, otherwise the drug leather easy to crack and peel off) to prevent the electrode drug skin sticky oil and other dirt, so as to avoid causing the weld to increase the carbon content and impact of welding quality. 8, in order to prevent corrosion between the eyes, the welding current is not too large, about 20 percent less than the carbon steel electrode, the arc should not be too long, rapid cooling between layers, in order to narrow weld heating is appropriate.
Duplex stainless steel in the actual welding process, the quality of welded joints by many factors, including reasonable welding process is the premise of duplex stainless steel welded joints to guarantee the quality of specific welding of duplex stainless steel, the actual welding process methods and inter-layer temperature is the key to determine the reasonableness of the selected welding process. Through observation and analysis of the microstructure of different welding methods and interpass temperatures SAF2205 duplex stainless steel plate butt welded joints, suggesting that the performance of welded joints and welding process used to assess the adequacy to arrive at a reasonable welding process. Experimental plates, wires and rods for Swedish the SANDVIK production of welding materials. GTAW Welding Wire22.8.3L, its specifications quasi-2.4mm × 1000mm; the SMAW electrode for 22.9.3LR specifications quasi-3.2mm × 300mm. The chemical composition of the sheet metal and welding in Table 1. GTAW and SMAW butt plate joint shown in Figure 1. GTAW welding method using tungsten inert gas shielded arc Aluminium Welding Wirebase, one-side welding forming, and then using the wire filling and capping. SMAW is a manual arc welding, filling and capping.