New technology in the application of steel structure

New technology in the application of steel structure welding (2)The new technology in the application of the steel structure welding

1 welding method

Steel structure industry welding rod arc welding, introduced in the 1940 s, 50 s former Soviet union the introduction of submerged arc welding technology, after 70 s, because of construction steel building box component and the wide use of medium plate, and continue to experiment and successful application of solid wires and flux-cored wire, CO2 gas shielded arc welding, submerged arc double wire welding wire, submerged arc welding, welding mouth electroslag welding, stud welding such as welding technology.

CO2 gas shielded arc welding in the application of construction steel structure, greatly improve the welding production efficiency, shorten the construction period, has gradually replaced manual covering electric arc welding. CO2 gas shielded welding, press (GMAW) welding wire can be divided into solid core wire and flux cored wire (FCAW) two kinds. Solid core or mixed gas protection welding, welding wire CO2 in construction steel structure production, according to the thickness and groove, crack sensitivity, to select the corresponding to the sprayed liquid, pulse current liquid, DE solid core welding wire, CO2 gas shielded welding, CO2 gas shielded flux-cored wire welding, with equal diameter compared to solid core welding wire, welding wire, metal industry area is smaller, under the same current level of the current density increases, the deposition efficiency of welding wire close to the solid CO2 welding. Under the same size of fillet weld, the spatter of small, easy to clean up and weld is concave, overall efficiency and economic benefits or even better than solid CO2 welding. British special pointed out that CO2 gas shielded arc welding due to the atmosphere of oxidation, the hydrogen content of deposited metal is extremely low, has good resistance to hydrogen cracking.

Self-protection flux core wire in construction Warehouse Building http://www.jingtabuilding.com/steel-structure-warehouse.html also started to use, because do not need gas protection, use more convenient, but because of self-protection flux cored wire diffusion hydrogen content is higher, so it is only applied to steel or cold cracking tendency is not important parts of the welding, then to solve the problem, it is the improvement of the performance of the resistance to cold cracking, the second is the lower cost of materials.

2 welding equipment

Construction steel structure application of welding equipment is mainly with manual welding, MIG and MAG welding, submerged arc welding machine, electroslag welding machine etc, with the development of power electronic technology and microelectronics technology, electric welding machine is moving in high quality, high efficiency, energy saving, development direction, such as controllability is strong, and welding of smaller volume, lighter weight, more suitable for field operation. The popularity of inverter power supply, in particular, has greatly promoted the development of the steel structure welding equipment, welding inverter power supply, the weight is only 1/5 to 1/10 for the traditional arc welding power source, volume down to 1/3 of the traditional arc welding power supply, the power output characteristics can control. If welding inverter controlled by microprocessor, only need to change the software or change panel operation instructions. Can be realized all kinds of welding methods, such as MAG, TIG, MIG, PuiseMIG etc., at present, a new control technique known as double zero switch started using resonant circuit in the inverter welding machine, its environmental protection, energy saving, high efficiency characteristics is more outstanding.

Throughout the domestic Steel Structure Building http://www.jingtabuilding.com/steel-structure-building.html industry application of welding equipment, mainly has the following characteristics and trends:

(1) the widespread adoption of advanced technology, welding machine functions more hasten is perfect;

(2) the level of mechanization, automation and complete sets of further improve;

3. Electronic computers and welding robot also started in the production of steel structure production applications.
New type of safe large-span steel structure
http://steelwarehouse.blogspot.com/2013/04/new-type-of-safe-large-span-steel.html