Longitudinal seam welding is a process used to produce linear welds on a wide variety of parts. For many industrial applications it is necessary to form the material into a desired shape, e.g. a cylinder or rectangular tube, and then weld the edges to form a rigid structure.
The traditional method of doing this is to manually hold the edges in alignment, tack weld them and then complete the linear weld. This is done manually or by use of a simple carriage carrying the welding torch.
This type of procedure is costly and time consuming for the following reasons:
Holding the edges accurately in alignment is difficult for the full length of the part.
Tack welding takes time and leads to defects in the area of the tack weld.
There is little effective chilling of the weld joint area leading to distortion and oxidation of the weld and surrounding area.
Maintaining the dimensional accuracy of the part is difficult.
The longitudinal seam welder clamps the materials to be welded firmly in alignment giving uniform chill to the weld. It also provides the facility to move the welding equipment accurately along the weld seam. This produces a butt weld free of melt-through, burn-backs, extreme shrinkage or distortion.
> LA-300~LA-1600 Longitudinal Seam Welders from MAY SHUAY TECHNOLOGY
MAY SHUAY specializes in manufacturing and marketing of high efficient and labor-saving turn key automatic seam welders for many years.
This longitudinal seam welding machine is specially designed to weld the straight seam of the cylinder, hot-water heater, drum, and square container. Back-up rod adopts water cooling method. Keyboard style pressure hold-down. Back-up rod can be changed as per requirement. Welded seam is flat and straight. Good weld penetration and weld quality.
Operator:
Stand up when working to maintain efficiency.
Easy operation. Just adjust the weld length, weld condition,. and weld gun position to produce stable and good quality product.
Control method:
Electric control: In using of PLC electric control system. It is a easy system for operating and upkeep
Inlet power: 1Ø220V, 50/60HZ
Inlet Air supply : 5KG/CM²
> LWH - Elevating Longitudinal Seam Welder from Jetline Engineering
The elevating style seam welder is essentially a variation of the combination model. Instead of a fi xed height riser, the tabletop and mandrel on the elevating models are mounted on support columns on which they can be moved up or down. Movement is through the use of a hydraulic cylinder with special fail-safe valves to ensure that the unit remains firmly in position, even in the event of a power failure.
The tabletop design can be based upon the external seam welder version (Model LWH) where all the welding is done with the part below the tabletop. Or the tabletop can be an internal style (Model LWHC) to allow parts to be loaded under or over the tabletop. The internal style provides the maximum range of part diameters.
Elevating style seam welders can be fitted with any type of welding equipment for any arc welding process. Due to the elevated working height, they are often supplied with remote control facilities including video monitoring and operator control stations.
Source: Jetline Engineering & MAY SHUAY Seam Welding