According to GB / T 983-1995 "stainless steel electrode" standard, stainless steel electrode can be divided into chromium stainless steel electrode and chromium-nickel stainless steel electrode two categories.
(1) Chrome stainless steel electrode
This kind of welding rod mainly consists of Crl3 series stainless steel electrode and Crl7 series stainless steel electrode. Welding characteristics of the two series of electrodes are described below:
1) Cr13 series stainless steel electrode: such as G202, G207, G217 and other electrodes are martensitic stainless steel Cr13 series electrode, with this series of stainless steel welding martensitic stainless steel, the weldment should be preheated before welding more than 300 ℃ , But also after welding the weldment to be carried out at 700 ℃ tempering, and only take the above process measures, in order to avoid weld and heat affected zone due to the greater tendency to crack and crack.
2) Cr17 series stainless steel electrode: such as G302, G307 and other electrodes are ferritic Cr17 series stainless steel electrode, with this series of stainless steel welding of ferritic stainless steel, the weldment should be preheated before welding 200 ℃, and welding After the weldment but also to 800% of the tempering, and only taken the above process measures, in order to avoid weld and heat affected zone 475 ℃ embrittlement and tend to crack due to greater tendency to harden.
(2) chrome-nickel stainless steel electrode
Such electrodes have good corrosion resistance and oxidation resistance, but, due to repeated heating in the welding process, the precipitation of carbide will reduce the corrosion resistance and mechanical properties, so the choice of chrome-nickel stainless steel electrode, welding should be considered Parts of the working temperature and media types.
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