Features of left and right welding methods for refueling vehicles

When the refuelling vehicle is welding, the welding torch and the welding wire must move. The purpose of this is to: (1) Make the weld metal melt through, but do not burn it. (2) Stir the molten metal bath so that various non-metallic inclusions in the bath exit the bath and allow the gas to escape from the bath. When using gas welding, first open the acetylene knob, and then slightly open the oxygen knob to ignite. Then adjust the two knobs to adjust the flame size and complete combustion state. Pay attention to prevent tempering. When cutting, do not leave the acetylene knob on the index finger of the right hand of the grip. In the event of a flashback (squeaking), immediately close the acetylene knob with the index finger of your right hand (turn the knob down and turn it in the off direction) and then close the oxygen knob. Second, it is best to wear colored protective glasses when welding.

According to the direction of the welding torch, the gas welding of refueling vehicles can be divided into the left welding method and the right welding method. (1) Left welding method. Also called forward welding. When welding to the left, the welding torch is directed to the site to be welded, welding progresses from right to left, and the welding torch moves behind the welding wire. The forward welding method has a preheating effect due to the advancement of the flame, the welding speed is faster, and a better penetration depth can be obtained. Therefore, the welding method is generally used for thin plates. (2) Right welding method. Also called back welding. When welding to the right, the torch points to the finished weld. The welding process moves from left to right and the torch moves in front of the welding wire. The back welding method is usually used for the welding of thick plates. The welding moves backward from the left end to the right side. The welding rod makes a circular motion on one side and follows the fire mouth forward. The welding torch moves along the welding line in a straight line.

The left and right welding methods of the refueling truck are all characterized by the following characteristics: (1) When the forward welding is performed, the welding flame is directed to the unwelded metal, which can play a preheating role and can weld deeper. (2) The welder can clearly see the molten pool, which is easy to operate and easy to master. (3) The welding method of the left-side welding method is easy to oxidize, the cooling is fast, and the heat utilization rate is low; the right welding method is special: (1) The flame points to the welding seam, which can well protect the molten pool metal and prevent it from being exposed to the surrounding air. Affects the weld slowly cooling. (2) Due to the concentration of heat, the angle of the steel plate groove during welding can be made small, and the shrinkage of the weldment is small, which reduces the deformation. (3) As the flame is facing the weld, it plays the role of tempering after welding, making it cool slowly, so the weld microstructure is fine and the quality is excellent. (4) High heat utilization rate can save the consumption of oxyacetylene and increase the welding speed. 5) The back-dip welding method is technically difficult, and it is not easy to work.

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