Dapeng Town Industrial Park, Tongshan District, Xuzhou City, Jiangsu Province, China
Welding is the main connection method of steel structure, which has played an important role in the construction of the steel structure. This article analyzes the construction process of high -strength steel welding, low temperature welding and thick steel plate welding.
The construction steel structure has the advantages of light weight, short construction cycle, strong adaptability, rich appearance, and convenient maintenance. Different welding methods have different welding processes. The welding process is determined mainly based on the material, plate, chemical composition, welding structure type, and welding performance requirements of the welded parts. First of all, the welding method is determined, such as arc welding, buried arc welding, melting and gas protection welding. There are many types of welding methods, and they can only be selected according to specific conditions. After the welding method is determined, formulate welding process parameters. The types of welding process parameters are different. For example, the arc welding mainly includes: the electrode model (or brand), diameter, current, voltage, welding power supply type, polar connection method, number of welding layers, number of lanes, inspection methods, and so on.
Preheating is an effective measure to prevent low -intensive steel welding hydrogen cracks. It can control welding cooling speed, reduce or avoid heat effects, and at the same time can reduce welding stress and help the recovery of hydrogen. The determination of the preheating temperature is related to the material, plate thickness, joint form, environmental temperature, hydrogen content and restraint of welding materials.
Select the appropriate welding process, flat welding, standing welding, horizontal welding, superstructure, etc.; Short arc welding, the arc length is generally 2 to 4mm. Welding port cleaning: Check whether the rocker and the assembly meet the requirements. There must be no oil and rust in the weld. When baking, it should meet the prescribed temperature and time. After removing the box from the oven, it should be stored in the insulation barrel. According to factors such as welding levels, stripe models, diameter, thickness, welding skills, etc., the appropriate welding current is selected. Welding speed: Requires to wait for speed welding to ensure the consistency of the thickness and width of the weld. From the mask, the iron water and the residue in the molten tank should be kept (2 to 3mm). Welding is determined according to the different models of the electrode, and the arc is generally required to stabilize the arc. The acidic stripes are generally 3 to 4mm, and the alkaline stripes are generally 2 to 3mm.
There are usually two aspects of the welding angle. One is between the angle between the strip and the direction of the welding forward of 60-75; the second is that there are two cases between the angle between the ahead and the left and right of the welding: when the thickness of the welding parts is equal, the stripes and welding and welding The angle between the pieces is 45. When the thickness of the welding parts is not equal, the angle between the fringe and the one side of the thicker weld should be greater than the angle on the side of the thack and the thin welding part. At the end of each welding seam, after filling the arc pits, the arc should be tied in the opposite direction of the welding direction, so that the arc pit is thrown in the welded channel. After the welding is over, the air cutting is used to remove the arc plate and repair it. Clear slag: After the entire welded seam is welded, the residue is removed. After the self -inspection of the welders, there is no problem. When the temperature is below 0 ℃ during the winter period, in addition to observing the provisions of normal temperature welding, the parameters of the welding process should also be adjusted to slow down the weld and thermal affecting area. The unprepared joint after welding should be avoided. When the temperature of the work location is below 0 ° C, the process test is required to determine the appropriate preheating temperature.
