According to the nature of different drug skin electrode, welding electrodes can be divided into acidic and alkaline electrode into two categories. Skin contains large amounts of acidic drug oxide (TiO2, SiO2, etc.) of the electrode is called acid electrode. Skin contains large amounts of drugs alkaline oxide (CaO, Na2O, etc.) as basic electrodes. Acid electrode to AC and DC welding performance is better, but the mechanical properties of the weld, especially in poor impact toughness, suitable for general low-carbon steel and low strength low-alloy structural steel welding is the most wide electrode. Alkaline electrode desulfurization, dephosphorization ability, the role of drug skin with dehydroepiandrosterone. Welded joints is very low hydrogen content, it is also known as low-hydrogen electrodes. Alkaline electrode welds with good crack resistance and mechanical properties, but the process performance is poor, usually with a DC welding, mainly for important structures (such as boilers, pressure vessels and alloy steel, etc.) welding.

Recognition electrode is acidic or alkaline?

See welding grades. Structural steel, for example: grades, the preparation method. Knot XXX, became structural steel welding rod, the first three numbers represent the type of drug skin, welding current requirements, the number 1 and 2: on behalf of the weld metal tensile strength. Acidic drug electrode main component of skin acidic oxides such as silica, titanium dioxide, iron oxide and so on. Basic electrode for the main component of skin medicine alkaline oxides, such as marble, fluorite.

Alkaline better crack resistance welding, the weld rod is not clean or clean-up is not easy drying air hole.

Say that crack, and income from the arc at the arc to produce crater cracks, and if the weld cracks at the regular shows you do not match the base metal and welding rod

Welding can be divided into several categories: carbon steel electrode, stainless steel welding rod, Welding Electrodes, cast iron welding, silver welding, heat-resistant steel electrodes, low temperature steel electrodes, copper electrodes, aluminum electrodes, cobalt-based electrodes, nickel electrodes, cellulose pipe welding, underwater welding, cutting and welding and so on. The main specifications are: 2.5 3.2 4.0 5.0mm

What types of electrode wear?

D-667-type high-chromium cast iron wear-resistant welding rod: This rod can be surfacing in the low, medium carbon steel, low alloy steel, high manganese steel and cast iron parts surface. Can withstand high impact wear, weld hardness HRC ≥ 55-65. 500 ℃ high temperature in the following with good resistance to abrasion, corrosion and cavitation capability. Generally increase the life of 3-8 times the weldment. This can be multi-electrode welding, welding layer 3 in order to achieve the best results (because the basic point is surfacing electrode composition, base metal composition rarely) the total thickness of surfacing not more than 1 cm is appropriate. For welding high temperature operating conditions of wear parts (such as: ring fired furnace discharge plow plow better). Welding operation by the strong impact of wear parts (such as: mining and cement crusher tooth plate) and D-266 model with the use of high manganese steel surfacing economy better. The electrode in use, according to the instructions, before the welding electrode drying, preheating welding pieces of clean, slow cooling after welding. D-698 graphite type coating for welding electrodes, AC and DC. For mineral soil sediment and rock crushing machinery wear parts of the welding strong. Deposited metal hardness HRC ≥ 60. D-707 wear-resistant tungsten carbide surfacing electrode: carbon steel, low hydrogen sodium type core tungsten electrode, the DC reverse. Suitable for concrete mixer blades, bulldozers, high-speed sand box, dredging machine blades. Deposited metal hardness HRC ≥ 63-75. D802 D812: cobalt-based electrode valves: cast cobalt-chromium-tungsten alloy core welding electrode welding, legal drugs into the skin by dipping the electrode surfacing, should adopt the DC reverse. Deposited metal at 1000 ℃ still have good wear resistance and corrosion resistance. Application: Suitable for high temperature and pressure valves, high pressure pump shaft sleeve and inner sleeve, and chemical fiber equipment and other parts of the mouth of the cut edge of surfacing. Surfacing hardness HRC ≥ 40 Note: 1, before welding electrodes shall be subject to about 200 ℃ bake 1 hour or more re-applied solder. 2, as far as possible when short arc welding, and Welding Rods work vertical. 3, according to the size of the work and the type of base material shall be 300 ~ 600 ℃ preheating. Should adopt the low current short-arc welding. 4, after welding should be tempered at 600 ~ 700 ℃ 1 hour after working in relief will be immediately placed in cold or dry and hot sand box or kelp in the slow cooling to avoid cracking. 5, the surfacing shall be coarse, if found defective, the above steps welding and slow cooling. Cobalt welding wire Description: welding D802 cast cobalt-chromium-tungsten alloy wire core welding wire welding, welding core by dipping into the legal system surfacing wire, deposited metal at 1000 ℃ and still have good wear resistance and corrosion resistance. Application: Suitable for high temperature and pressure valves, high pressure pump shaft sleeve and inner sleeve, and chemical fiber equipment and other parts of the mouth of the cut edge of surfacing. Weld metal chemical composition (%) C 1.0 ~ 1.7 Cr 26.0 ~ 32.0 W 7.0 ~ 10.0 Mn ≤ 2.0 Si ≤ 2.0 Fe ≤ 3.0 Co margin surfacing hardness HRC ≥ 40 specifications φmm 2.5 3.0 D968: graphite type coating of welding electrode, AC and DC. Deposited metal hardness HRC: 61 ~ 66. YM602W-Cr-B: graphite type coating, both AC and DC, for carbon steel, cast steel, manganese steel base metal coated with solder. Welding layers of high strength against the external play the role of wear, such as strong on a variety of devices easy to wear pieces. Deposited metal hardness HRC: 61 ~ 66. D-708: Tungsten welding electrode wear: wear-resistant alloys with a variety of DC welding. Strong rock for surfacing wear-resistant mechanical parts such as fan blades, concrete mixer blade, pink stone hammer, charcoal machine screw and other wear parts for surface repair. Deposited metal hardness HRC ≥ 70.