1. Definition of vertical welding: Vertical welding refers to welding along the joint from top to bottom or from bottom to top. The welding position with a weld inclination angle of 90° (vertical upward) and 270° (vertical downward) is called the vertical welding position. Welding that is performed at the vertical welding position is called vertical.
2. Characteristics of vertical welding: during vertical welding, the molten pool metal and molten droplets have a tendency to fall due to gravity and are separated from the weldments, so it is easy to produce welding tumors. However, due to the low melting point and strong fluidity of the slag, the molten pool metal and the slag are easy to separate, and it is not easy to produce slag inclusions. However, due to the fact that the molten pool is partially separated from the protection of the slag, it is easy to generate porosity if the operation or the angle of the transport bar is improper.
3. The angle of vertical welding: vertical welding is the angle of the welding rod is 60 to 80 degrees, from the bottom of the weld to the direction of the fox, the left stone of the welding rod swings evenly during the welding process, and a slight pause should be made at both ends to achieve the full fusion of the base metal and the molten iron pool.
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Selection of welding direction: I personally think that it is better to weld from the bottom up, which is mainly due to the convenience of welding and the accumulation of deposited metal, which reduces the difficulty of operation.
5. Vertical welding posture: The basic operation posture of vertical butt welding has three types: squatting, sitting and standing.
6. Vertical welding holding method: clamping method. There are two kinds of gripping methods for vertical welding tongs: forward grip and reverse grip, and the positive grip method is generally commonly used when welding. In order to achieve full penetration in the direction of the thickness of the weldment, in order to achieve full penetration in the direction of the thickness of the weldment, the weldment should be welded by opening the V-shaped groove.