Technology and process of gas shielded welding
Carbon dioxide gas shielded arc welding is a welding method with carbon dioxide gas as shielding gas. Demonstration of gas shielded welding technology Clean the weld bead at the vertical welding position, and pay special attention to grease, welding slag and water. To know the size of the fillet to be welded, first burn a standard fillet according to the size of the fillet.
Note that high quality welding must be from bottom to top. Start the arc striking at the standard welding angle. When the welding wire swings left and right, be careful not to go beyond the scope of the molten pool (formed by the complete dissolution of the welding wire). When swinging left and right, stop at both sides.
The length of time depends on the determination of welding angle. If the welding angle is too large, it is recommended to weld several times. Generally, the first small spot welding will be fine. If it is too big at one time, it is easy to have insufficient thickness and ugly appearance, and both sides are easy to bulge. When swinging from side to side, it is necessary to control the rhythm, weld slowly upward, and pay attention to the stability of both hands, which is a necessary prerequisite for high-quality welding.
Upward vertical welding has large penetration depth and is easy to penetrate. Although the lower part of the molten pool is supported by the weld, the bottom of the molten pool is an inclined plane, and molten metal is easy to drop down under the action of gravity, so it is difficult to ensure the smoothness of the weld surface.
In order to prevent molten metal from dripping down, it is necessary to use a slightly smaller current than flat welding, the swing frequency of the welding gun should be slightly faster, the welding should be carried out in a swing mode with a smaller sawtooth pitch, so that the molten pool is small and thin, and the droplet transfer adopts a short-circuit transition form.