Method for welding cylindrical shell of water heater

Abstract

The invention discloses a method for welding a cylindrical shell of a water heater. The method comprises the following steps of: preparing a cylinder body which has a shape of a circular pipe, preparing a sealing cover of which bottom edge has a shape matched with that of an end edge of the cylinder body, butting the sealing cover in a mode that the bottom edge faces the end of the cylinder body, arranging a placement tool on the inner sides of the end edge of the cylinder body and the bottom edge of the sealing cover in a detachable way, recessing a casting channel corresponding to the gaps of the sealing cover and the bottom edge on the outer circumferential surface of the placement tool, welding along the butting part of the sealing cover and the end edge of the cylinder body to ensure that a welding point is connected with the bottom edge of the sealing cover, and the end edge of the cylinder body in a melting way and is cast in the casting channel so as to form an inner welding pass; and by the welding means, an outer welding pass and the inner welding pass which have the supporting function can be formed on the outer and inner sides of the welding part of the sealing cover and the cylinder body respectively to ensure that weak points around the welding part are avoided, the cylindrical shell of the water heater, which is manufactured by welding can bear larger pressure, the inner and outer complete butting melting way is adopted by the welding part of the sealing cover and the end edge of the cylinder body and seams are avoided, and the corrosion, and change of electrical and chemical performance are avoided when water is filled in a cylinder.

Description

technical field [0001] The invention relates to a welding method, in particular to a water heater cylinder welding method. Background technique [0002] Existing water heater cylinder welding methods, such as Image 6 , Figure 7 as well as Figure 11 to Figure 13 As shown, it is the existing method of stitch welding, which is to be provided with a cylindrical tube body 30, and the end edge cover of the corresponding tube body 30, 30A is combined with the cover 31, 31A, and then the tube body 30, 30A is connected with the seal The gap between the outer surfaces of the covers 31 and 31A is welded so that the welding spots B and D are fused between the barrel body 30 and the outer surfaces of the cover 31 . [0003] Although the above-mentioned existing stitch welding method can weld the cylinder body 30 and the cover 31 to form a water heater cylinder, but because the weaker welding points B and D are welded close to the turning part, this place becomes a weaker joint. Poo...

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Problems solved by technology

[0006] Due to the current welding method of the water heater cylinder, it is easy to form a weak point at the welding point or produce a welding gap on the inner side of the cylinder, so that water can penetrate into the gap, causing problems of insufficient pressure resistance or corrosion

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