Mirror welding process, as well as difficult analysis.

【Summary Description】 1. Mirror welding principle Mirror welding is a welding operation technology based on the mirror principle, supplemented by mirror observation to control the welding operation process. It is mainly used for the welding of welds that cannot be directly observed due to the narrow welding position. Painting Generally, there are two requirements for the fixed position of the mirror. One is to facilitate the naked eye to observe the situation of the molten pool through the reflection of the mirror, and the other is not to affect the position of the argon arc welding gun and the walking and swing of the welding gun during the welding process. The relative position of the mirror and the weld is adjusted according to the distance between the tube rows. 2. Preparation before welding (1) Strictly control the butt gap of spot welding, generally 2.5~3.0mm is appropriate, and the spot welding seam position should be on the front of the pipe. (2) Placement of the lens: Place the lens horizontally in the initial welding area, simulate the welding trajectory with a welding gun, and adjust the distance and angle of the lens to make the lens in the best position for welding observation. (3) Check that the argon flow rate is generally 8~9 L/min, the tungsten electrode extension length is 3~4mm, and the arc curvature of the welding wire is prefabricated. 3. Difficulty Analysis of Mirror Welding (1) Mirror imaging is reflection imaging. During the welding operation, the welder sees that the radial direction of the nozzle is opposite to the actual direction. In the welding process, it is easy to feed the wire to the molten pool in the mirror, which affects the normal welding. Therefore, the swing of the welding arc and the action of the filling wire are difficult to be coherent, consistent and coordinated, which is easy to cause phenomena such as the arc is too long, the tungsten is clamped, the filling wire is not in place, and the end of the welding wire collides with the tungsten electrode. Painting (2) The lateral swing and movement of the welding arc are not flexible enough, which is easy to cause incomplete penetration, depression, incomplete fusion, undercut and poor root forming; if the welding speed is too slow, defects such as pores are easy to occur. (3) Through the mirror observation of the molten pool, the arc reflection is very strong, and it is difficult to see the tungsten rod. When feeding the wire, it is easy to cause the welding wire to collide with the tungsten rod, deform the tip of the tungsten rod, affect the stability of the arc, and easily produce defects such as tungsten clamping. (4) The weld seen through the mirror is a flat image. The three-dimensional sense of the weld in the mirror is not strong, and the mirror images of the arc and the molten pool are superimposed on each other. The arc is too strong and it is difficult to clearly distinguish the molten pool. Therefore, the control of weld thickness and straightness will directly affect the forming quality of the weld.

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