Welding methods of stainless steel plate is following below:
1. Butt joints
Butt joints are the most common forms of joints. They can be divided into I-shaped butt joints (not beveled), V-shaped bevel joints, U-shaped bevel joints, X-groove joints and Double U-shaped groove joints and so on. General thickness of 6mm or less, the use of not open groove and leave a certain gap of the double-sided welding; medium thickness and large thickness butt welding of components, in order to ensure penetration, must open the groove. The V-shaped groove is easy to process, but the post-weld part is easily deformed. The X-shaped groove has a symmetrical section of the weld. The deformation and internal stress of the workpiece after welding is smaller than that of the V-shaped groove. Under the same plate thickness condition, the X-shaped slope of the mouth is reduced by 1/2 of the amount of filler metal compared to the V-shaped groove. U-shaped and double U-shaped bevels, with less weld filler metal and less post-weld deformation, but this type of groove is difficult to machine and is generally used for important structures.
2. Arc welding basic operating techniques
a. Arc: The arc welding of arc welding adopts the arc method of contact arcing, and there are mainly two kinds of scratching method and direct striking method.
Scratching method: first align the electrode with the arc, twist the wrist, like the match, make the electrode slightly scratch about 20mm at the arc, then lift the arc with a height of 2~4mm. Its characteristics are: easy to damage the surface of the weldment, easier to grasp, generally suitable for alkaline electrodes.
Direct stroke method: first align the welding rod with the arc, bend the wrist, make the electrode tap the workpiece vertically, and then lift the ignited arc with a height of 2-4mm. Its characteristics are: the arc starting point is the starting point of the weld, to avoid damage to the surface of the weldment, but not easy to grasp, generally applicable to the welding of acid electrodes or in narrow places.
When starting the arc, if the electrode sticks to the weldment, the electrode can be removed from the weldment by simply swinging the electrode from side to side. If the weldment cannot be separated from the weldment, the welder should be disengaged from the weldment immediately. After the electrode is cooled, hand it. Twist off; if there is a sheath sheath on the end of the electrode, use a gloved hand to remove the sheath and start the arc.