Stainless steel electrode for chromium content greater than 10.50% , nickel content of less than 50% of the corrosion-resistant steel or heat resistant steels , stainless steel should be used according toMaterial, working conditions ( including temperature and contact with the medium )
To choose. Mainly from the following aspects:â‘ In the high temperature environment -resistant stainless steel , selected to meet the welding mainly thermal cracking of weld metal and thewelded joints of high performancePerformance. For the Cr / Ni â‰¥ 1 austenitic heat-resistant steel, such as1Cr18Ni9Ti, Cr17Ni13W , is normally used austenitic - ferritic stainless steel electrode ; if the Cr / Ni <1 stable austenitic heat-resistant steelSuch as Cr16Ni25Mo6, Cr15Ni25W4Ti2 etc. , should generally be in Bulgaria
Permit the weld metal and base metal chemical composition having substantially similar , while increasing weld metal Mo, W, Mn and other elements in order to improve the weldCrack resistance.â‘¡ work in a variety of corrosive media, the corrosion of stainless steel , should be based on media and temperature to select the electrode. For operating temperature above 3000C, There is a strong corrosive media , the selection of stable containing Ti or NbElements or ultra-low carbon stainless steel electrode ; For media containing sulfuric acid or hydrochloric acid , often used with Mo and Cu oMo-containing stainless steel electrode ; righto work at room temperature , corrosive weak or just avoid rust contamination
Equipment , can be used free of Ti or Nb stainless steel electrode.â‘¢ of chromium stainless steel , such as martensitic stainless steel 1Cr13, ferritic stainless steel 1Cr17Ti etc., in order to improve the ductility of welded joints , use of chromiumNickel austenitic stainless steel electrode
1 , chromium stainless steel with a corrosion ( oxidizing acids , organic acids , cavitation ) , heat and wear resistance. Typically used in power plants , chemical industry,Oil and other equipment and materials . Chrome stainless steel welded poor, should pay attention to
Welding , heat treatment conditions and the appropriate choice of welding .Â 2 , chrome 13 stainless steel after welding, hardening of large , prone to cracking. If you use the same type of chromium stainless steel electrode (G202, G207) welding,Must be above 300 â„ƒ preheating and post-weld about 700 â„ƒ slow-Cold treatment . If the weldment weld heat treatment is not possible , you should use chrome-nickel stainless steel electrode (A107, A207)3 , 17 chromium stainless steel , Nickel Alloy Welding Wire the corrosion resistance and weldability and appropriate amount to increase the stability of elements Ti, Nb, Mo , etc., welding resistance than chromium 13 doesStainless steel better. Using the same type of chromium stainless steel electrode (G302, G307) , should be above 200 â„ƒ preheating and post-weld tempering at about 800 â„ƒ . If you can not heat treated weldments , should be usedChrome-nickel stainless steel electrode (A107, A207).4 , chrome-nickel stainless steel electrodes with good corrosion resistance and oxidation resistance, widely used in chemical , fertilizer , petroleum, medical machinery.5 , chromium -nickel stainless steel welded when subjected to repeated heating carbide precipitation , reduce corrosion resistance and mechanical properties.6 , chromium -nickel stainless steel with titanium calcium type coating and lowLow Alloy Steel Electrodes type . Titanium calcium type can be used for AC and DC , but AC welding shallow penetration depth , and easy to redness,Therefore, as far as possible with DC power supply . Diameter of 4.0 and below can be used for allLocation weldments , 5.0 and above for a flat butt and fillet welding.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 shall be approved by 200 ~ 250 â„ƒ dried for 1 hour ( no moreRepeated drying, easy to crack and peel off the skin or drugs ) to prevent the electrodeMedicated skin sticky oil and other dirt in order to avoid causing increasing carbon content and impact of the weld weldment quality .8 , in order to prevent corrosion of heat generated between the eyes , the welding current should not be too large, less than about 20% carbon electrode , arc not too long,Interlayer rapid cooling to narrow weld is appropriate.9 , dissimilar steel welding electrodes should be carefully selected to prevent the improper selection of welding or high temperature thermal cracking occurs due to Ïƒ phase precipitation heat treatment , the goldIs brittle. Refer to stainless steel and dissimilar steel welding rod selection criteriaFor selection, and take the appropriate welding process.