There is a relatively technical activity in the welding of roll forming equipment. There are many factors to consider, such as the thermal expansion coefficient of steel and the restraint of the street. The coefficient of thermal expansion of steel generally does not change greatly, and the degree of restraint is related to various factors such as the form of structural joints, the order of welding, the thickness of the plate, and the degree of fastening of the external fixture, so it is difficult to control.
The assembly of roll forming equipment is under the action of welding stress. If the degree of restraint of the weldment is small, such as thinner plate thickness or free and unconstrained state, the weldment will have corresponding dimensional changes or shortening or bending or warping. . If the degree of restraint of the weldment is large, such as a large plate thickness, a complicated shape, or a strong restraint state due to an artificially applied jig, the weldment cannot be freely deformed at this time, but localized under the action of welding stress. Strain, while generating large residual stresses. The peak value of the residual stress in the weld zone can reach the yield strength value of the material.
The welding of roll forming equipment is very important, so the relevant staff must pay attention to it.
