Inert gas shielded welding methods for repairing or reconnecting damaged parts or spare parts include various butt welds, lap welds, flange welds, plug welds, and spot welds. Each type of weld can be welded in several different ways. The method used depends mainly on the given welding conditions and parameters. These conditions and parameters include: the thickness and condition of the refuelling vehicle metal, the number of cracks between the two metal workpieces to be welded, the welding position, and the like. For example, butt welding can be carried out by means of connecting welding or continuous spot welding. In the case of permanent continuous or continuous spot welding, it is also possible to perform tack welding along many different points on the weld and use this method to fix the workpiece to be welded. The lap and flange connections can use the above six welding techniques.
Butt welding is a method of attaching together metal plate edges on two adjacent refuelling carts and welding the two metal plates together or to the butt edges. When performing butt welding, care must be taken that the length of each weld is preferably not more than 3/4 in. Pay close attention to the melting of the metal plate, the welding wire and the continuity of the weld. Also note that the end of the wire must not deviate from the butt joint between the plates. If the weld is long, it is best to perform tack welding (continuous spot welding) at several places on the metal plate to prevent deformation of the metal plate. The same applies to lap welding or flange welding in which both surfaces are melted at the edges of the upper surfaces of several overlapping metal plates that need to be joined, similar to butt welding. The difference is that there is an edge on the upper surface. Lap or flange welding can only be used to repair the place where such welding was originally performed at the factory, or to repair the outer plates and non-structural metal plates. When more than two layers of metal need to be welded, this method cannot be used.
When gas shielded welding is performed on galvanized steel, zinc does not have to be removed. If the zinc is worn off, the metal thickness decreases and the strength also decreases. If a zinc-free zone is created around the weld, this zone will be highly susceptible to corrosion. When welding galvanized steel, the speed should be lower with a non-plated steel because the zinc vapor easily rises within the arc and interferes with the stability of the arc. The lower speed of the torch allows zinc to burn off at the end of the weld pool. According to the thickness of the galvanized layer, the type of welding and the location of the welding, the value required to reduce the torch operating speed needs to be determined. Compared with non-plated steel, the galvanized steel has a slightly shallower weld penetration, so it requires a slight butt weld to the right-angled edge of the base. In order to prevent a wide gap from causing burn-through or excessive penetration, the welding torch should be swung from side to side during welding. Note: Zinc vapor is toxic and requires good ventilation. Operators must wear gas-resistant gas masks when welding on refuelling vehicles.
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