a, with a special high-temperature corrosion resistance welding energy (creep rupture strength and elongation)
b, excellent resistance to intergranular corrosion and high toughness -196 ℃ urea grade stainless steel electrodes.
c, cavitation-resistant stainless steel welding electrodes.
d, poor welding of chromium stainless steel special electrodes.
e, moisture absorption resistance of stainless steel welding rod.
f, directed under the special stainless steel welding electrodes, such as AVESTA VDX330, PHILIPS BM316-V.
g, special stainless steel welding electrodes positioned as PHILIPS BM316L.
6, electrode manipulation of process performance. Since the intrinsic properties of stainless Welding Wire Chinais insignificant, so the stainless steel welding electrode of the control process is to compare the main performance, the following are a few to determine the level or standard.
a, off the slag. Requirements in the T-joint fillet welds, fillet and butt welding Ying positions, such as boat off the net and in the flat welding slag, slag can fillet weld location from Alice, the entire loss, edges and weld surface without sticky residue.
b, splash size. Statement by AVESTA sample can be divided into three levels of spatter (litter spatter or usually spatter), flying small (very little spatter) and no splash (no spatter). The majority of domestic at the first level, a few manufacturers at the second level, there were no third-level non-flying stainless steel electrode.
c, then arc, require drug leather sleeve dark straight, depth of 3mm or more, and then arc very easily, under general conditions, without interval restrictions.
d, all-position welding, especially large size of 4mm above the all-position welding electrode is better.
e, weld shape and color, required weld thin beauty bright, in most cases, weld silver or gold color was yellow.
As the petrochemical industry, medical equipment, food machinery and the rapid development of atomic energy industry, steel production, or both species have a larger growth. Since 1995, the Western developed countries, the development of stainless steel production has been extraordinary. Stainless steel crude steel production output is close to 3% (only 0.3% of China). Manufacture of capital lower than in 1980, more than 50%, and 329 for the United States on behalf of S31803 austenitic / ferritic duplex stainless steel scale production in 1987, these low nickel stainless steel has been recognized performance may gradually replace the 316 stainless steel as in nitrogen, hydrogen sulfide and other impurities in the use of better materials, the environment, while also supporting the development of a variety of electrodes, deserves our attention.
1, duplex stainless steel welding rod, is the microstructure of duplex stainless steel by the 50% F and 50% A balance of a class composed of stainless steel, due to a bipolar organization, both austenitic and ferritic stainless steel characteristics, compared with the ferritic stainless steel, duplex stainless steel, high toughness, brittle transition temperature, resistance to intergranular corrosion and weldability are obvious progress, while preserving the ferritic stainless steel of some of the features, such as 475 ℃ brittle, high thermal conductivity, and magnetic properties with superplasticity, compared with the austenitic steels, duplex stainless steel, high strength, resistance to intergranular corrosion, stress corrosion resistance, and significant progress, excellent price-performance duplex stainless steel is stainless steel.
These steels are characterized by: 22-25% chromium, nickel, 5-7% below the 304,316 level of austenitic stainless steel, have added a certain amount of molybdenum, and a small amount of nitrogen, and some also add copper and tungsten . Duplex stainless steel for the evaluation of pitting corrosion in chloride environment the ability to resist the establishment of a pitting resistance equivalent values ??(PRE)
PRE =% Cr +3.3 ×% Mo +16 ×% N
General PRE25-43, when the PRE is usually referred to as more than 40 super duplex steel. Now have developed all kinds of domestic and duplex stainless steel welding rod, such as the UK Manche Te (METRODE) duplex stainless steel company more than 10 varieties, including standard dual-phase steel welding rod, super duplex steel electrode, Li Yang welding dual-phase-specific Aluminum Electrode. Iron and Steel Research Institute, domestic happiness Technologies AG of four duplex stainless steel welding rod, Beijing Jin Wei and Sichuan Atlantic, also developed a 2209 duplex stainless steel welding rod.
2, the new boiler with stainless steel electrode development.
In order to further progress with a stainless steel tube boiler high temperature creep strength, high temperature corrosion properties and resistance to steam oxidation, Japan and the existing SA213-TP304H TP310H two kinds of austenitic steels has been improved, the development of supercritical good overall performance , ultra-supercritical boiler with stainless steel tube new material that is super-304H stainless steel and supporting electrode.
3, general stainless steel welding rod of the series, professional.
Stainless steel commonly used for industrial species, such as 304, 316 type. Consider the needs of foreign welding process, developed a variety of special electrodes such as AVESTA company dedicated 308L/MVR-PW pipe welding, welding vertical down welding 308L/MVR-VDX food and medical equipment for the use of very small splash Japan Oil, EX-series electrodes.
Also with stainless steel metallurgy industry, has developed a variety of foreign performance of stainless steel welding rod, hand to meet the needs of various industries. Such as Japan Oil (TASETO) for the common electrode 308 of the 308,308 L in addition to common electrode, but also developed a progressive high performance 308HL electrode for a very low temperature 308LA electrode to control the carbon content in order to progress their different corrosion resistance The 308L3, 308L2 electrode. Japan taking over the company in addition to the above dissolved species, but also developed with a certain amount of nitrogen in order to progress the weld strength WEL308N2, WEL316LN other nitrogen-containing stainless steel electrode, foreign companies also committed to develop some special stainless steel electrode in order to meet special needs by users.