Select the electrode based on the steel chemical composition, mechanical properties, crack resistance requirements, taking into account the comprehensive analysis of welded structures, plate thickness, working conditions, stress, welder performance and other factors. Necessary, to do the welding test, formulate corresponding measures to determine the selection of the electrode. â’ˆ carbon steel welding is generally used in steel strength grade corresponds to the electrode, taking into account the complex structure, slab stiffness, dynamic load, poor weldability is generally used in good plasticity, impact toughness, good crack resistance of low hydrogen electrodes. Special requirements of the welding position, using the corresponding special electrode, such as vertical down welding rod, the base electrode. Iron powder type electrode can be used to improve the welding efficiency. â’‰ fast on the weld cooling rate, increased strength, weld cracks easily, lower than the parent material strength level electrode can be used; between the low-carbon steel and low alloy steel, dissimilar steel welding is generally used with low strength grade steel electrode, and considering the factors of low-alloy steel, in order to use low-hydrogen type is appropriate. â’Š welding of medium carbon steel, due to higher carbon content of steel, Cast Iron Welding Electrode increasing the tendency of welding cracks, generally used in low-hydrogen electrodes and preheating and slow cooling method and adapt welding processes and other measures. â’‹ cast steel weldable poor generally higher carbon content, the workpiece Heavy, complex structure, easy to produce a weld crack cast steel alloying elements for a long time, it is more prominent. Generally used in low-hydrogen electrodes, and to take measures to warm-up, slow cooling method and the corresponding welding process. â’Œ as to ensure the quality of welding, the workpiece weld should be clean, not allowed to have oil, rust, water, Carbon Steel Electrodepaint and dirt, is particularly important to use low-hydrogen electrodes. â’ low hydrogen type electrode, Welding electrodes shall be subject to 350 ° C baking 1h as baking, or easy to produce pores folder slag, cracks and other defects. Cellulose electrode without baking in general, if damp, temperature welding instructions provided before baking, but the temperature will destroy the electrode welding performance. Welding current specified in â’Ž instructions as a reference value, the actual operation should be specific to master, such as workpiece preheat than normal current 5% to 15%; vertical welding and overhead welding flat welding current 10% to 15%; DC than AC decreases about 10%. Attention to the instructions provided in DC welder, welding class nature, or affect the welding process. â’ low hydrogen type electrode generally should not be repeated baking to prevent drug skin crisp, fall off.
D822 features: high-carbon cobalt-chromium tungsten alloy welding core of cobalt-based hardfacing electrode, DCRP, residue coverage, forming beautiful, with excellent wear, heat, corrosion resistance, in the high temperature of 650 â„ƒ Keep these characteristics. Uses: used for the surfacing of the cone bit bearings,Welding Rod the rotating impeller of the boiler, pulverizer edge, screw feeder and other wear parts. The D842 features: cobalt-based low-carbon cobalt base chromium tungsten alloy welding core surfacing electrode using DC reverse, the deposited metals in the 800 ° C to maintain good thermal fatigue resistance and corrosion resistance. Uses: used in high temperature conditions to withstand shocks and hot and cold staggered workpiece surfacing, such as forging die, the valve sealing surface, with good performance. The D658 features: high-chromium cast iron welding electrodes, with excellent resistance to abrasive wear, operating temperature up to 650 ° C, AC and DC arc stability, and almost no residue. Uses: Used to wear the serious parts and high temperature wear and tear parts. D667 high chromium cast iron electrode wear: This electrode can be surfacing in the surface of the low, medium carbon steel, low alloy steel, high manganese steel and cast iron parts. Able to withstand high impact wear, post-weld hardness of HRC ≥ 55-65. Below 500 â„ƒ, with good resistance to abrasion, corrosion and resistance to cavitation ability. General increase the weldments life 3-8 times. This electrode can be a multi-layer surfacing, Stainless Steel Welding Wiressurfacing layer 3 in order to achieve the best results (surfacing of the total thickness of not more than 1 cm is appropriate at this time surfacing layer is basically the electrode composition, the base metal composition rarely). Surfacing operation under high temperature wear (such as: ring burning furnace discharge plow plow is better). Surfacing by operating under a strong impact wear parts (eg: mine and cement plant's crusher teeth plate) and D-266 type high-manganese steel surfacing used in conjunction with the economy better. The electrode, when used according to instructions for use, before welding electrode drying, welded pieces of clean-up warm-up, slow cooling after welding. The D678 features: tungsten cast iron surfacing electrode, AC and DC. Uses: used for the surfacing of the mining machinery and crusher parts subject to abrasive wear parts. The D680 features: boron high chromium cast iron welding electrodes, DCRP. Stable arc, little spatter, slag and slag off the surfacing layer is also difficult to carry out cutting carbide cutting tools, only grinding, the microstructure of martensite thick complex carbides. Purposes: for strong wear occasions, such as roller cone drill bit small-axis, coal hole excavators, to enhance the bucket, crusher roller pump frame tube, the mixture leaves. D687 drug skin types: low-sodium hydrogen: boron high chromium cast iron surfacing electrode, DCRP. Stable arc, little spatter, slag and slag off the surfacing layer is also difficult to carry out cutting carbide cutting tools, only grinding, the microstructure of martensite thick complex carbides.