The characteristic of welding of steel structure
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1 welding method Steel industry in the 20th century, 40 years to introduce arc welding electrode, the introduction of the former Soviet Union in the mid 50 submerged arc welding technology, 70 years later, as construction steel box components and the extensive use of plate, and gradually testing and implementation of successful application CO2 welding wire and flux cored arc welding, submerged arc double wire welding, submerged arc welding three-wire, melting mouth electroslag welding, stud welding and other welding techniques. CO2 gas shielded arc welding of steel in the building, greatly improved welding productivity, shorten the construction period, has gradually replaced the manual arc welding coating. CO2 gas shielded welding wire can be classified according to solid wire (GMAW) and flux cored wire (FCAW) two. Solid wire or a combination of CO2 gas shielded welding, steel production in the building, according to thickness and groove, crack sensitivity, may jet off to select the appropriate solution, the pulse current is too fluid, de CO2 gas shielded solid wires welding, CO2 gas shielded flux cored wire welding, and other than solid wire diameter, wire size was smaller, the metal sector, the current level at the same current density, deposition efficiency close to the wire of solid CO2 welding. Corner of the same size weld, due to splash, cleaning up convenient and more concave weld, the overall efficiency and cost-effective or even better than solid CO2 welding. British In particular, CO2 gas shielded arc welding because the oxidation of the atmosphere, the hydrogen from the amount of deposited metal is very low, has good resistance to hydrogen cracking. Since the welding flux cored wire used in the construction steel have begun, because no gas, more convenient, but because of the proliferation of self-shielded flux cored wire hydrogen content is high, there is currently only applies to cold cracking tendency of small steel species or important parts of the welding, since the problem to be solved, first, increase resistance to cold crack properties, the second is material costs. 2 welding equipment The application of building steel structure mainly manual welding welding equipment, MIG and MAG welding, submerged arc welding machine, electro-slag welding machine, with the power electronics and microelectronics technology, welding machine is moving in high quality, efficient , energy conservation, control, and other direction, and welding smaller, lighter and more suitable for field operations. Popularity of particular inverter, has greatly promoted the development of steel welding equipment, inverter welding machine, welding machine weighing only traditional power of 1 / 5 to 1 / 10, volume down to traditional arc welding power of 1 / 3, the power output external characteristics can be controlled. If the use of microprocessor-controlled inverter welding machine, just change the software or to change the operation panel features instructions. Can achieve a variety of welding methods, such as MAG, TIG, MIG, PuiseMIG, at present, a new control technology that is two-zero-switching resonant circuit in the inverter welder started, the environmental protection, energy saving and efficient features more prominent .
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