A continuous seam welding, roll disk continuous rotation, the current constantly through the workpiece. This method is easy to make the overheating of the surface electrode wear is serious, and therefore rarely used. High-speed seam welding (4-15m/min) 50Hz AC every half weeks to form a solder joint, AC zero crossing equivalent to the off time, which is similar to the following intermittent seam welding, and thus the system cylinder Barrel industry.
2 intermittent seam welding, roll disk continuous rotation, composed of discontinuous current through the workpiece to form a weld nugget each other to take Diego. Because the current is interrupted by rest time, the roll plate and the workpiece to be cooled, thus can improve the life of the rolling disk, reducing the width of the heat-affected zone and deformation of the workpiece, the better the quality of welding. This approach has been widely used in seam welding of a variety of less than 1.5mm steel, high temperature alloys and titanium alloys. Intermittent seam welding roller tray to leave the welding zone, the nugget crystallization under reduced pressure, so it is prone to overheating surface shrinkage and cracks (such as in the welding of high temperature alloys). Ride in the solder joints stacked more than 50% of the length of the nugget, the latter point of the molten metal can be filled before the shrinkage, but the last point of the shrinkage is difficult to avoid. However, the domestic development of computer control box, able to weld finishing part of the point by point to reduce the welding current, in order to solve this problem.
Step seam welding, roll disk intermittent rotation, the current through the workpiece when the workpiece is not moving, melting and crystallization of the metal in the roll plate fixed to improve the heat and pressure of the solid condition, and thus can more effectively to improve the Types Of Welding Electrodes quality and prolong the life of the rolling disk. This method more than aluminum, seam welding of magnesium alloy. For seam welding of high temperature alloys, and also can effectively improve the quality of welding, but the domestic exchange of this type of welder, and thus has not been applied. When welding the hard aluminum. And a thickness of 4 +4 mm above metal must be a Tungsten Welding Electrode, in order to form each solder joint can spot imposed by forging force, or while using warm cold pulse. In the latter case is rarely used.