The workstation consists of several equipments (including special-purpose machine welding and robot welding), with multiplier chain, jigs and fixtures, lifting table, transplanting and turning mechanism, etc., constituting a production line that can weld continuously, with each equipment corresponding to one weld, eliminating the need for special-purpose machines to adjust the gun time, and improving the welding efficiency.
The LNG vehicle tank is designed with a double-layer (vacuum) structure. The inner tank is used to store the low temperature liquid LNG, and the outer wall is wrapped with multiple layers of insulating material for superb thermal insulation, while the jacket (the space between the two layers of the container) is pumped into a high vacuum, which together form a good thermal insulation system. The shell and support system are designed to withstand the external forces associated with transporting a vehicle on the move.

The production line is customized according to client capacity requirements, either fully-automatic or semi-automatic.
The main processes of the production line include:
■ Plate feeding;
■ Cylinder rolling;
■ Longitudinal seam welding;
■ Cylinder pipes welding;
■ End cover necking;
■ End cover pipes welding;
■ Cylinder/End cover coupling;
■ Circumferential seam welding;
■ Bracket welding;
■ Leak testing;
■ Automatic conveyor system.

The design principle of this equipment is to adapt to the longitudinal seam welding of different diameters of workpieces through the lifting and lowering of the clamping table, and the height of the clamping table can be adjusted to weld large diameters of workpieces. It can meet the longitudinal seam welding of cylinder with workpiece diameter 1.5m-5m and workpiece length ≤4m.
When welding, the special copper liner is used to conduct the excess heat from the workpiece away from the weld quickly to reduce the burn-through of the weld and the warping and deformation of the workpiece. The machine can weld one side and form both sides, and guarantees 100% weld-through of the workpiece.
All weldable materials can be welded on the longitudinal seam welder, such as stainless steel, carbon steel, weldable aluminium alloys, heat-resistant alloys, zirconium alloys, molybdenum alloys and others.
This longitudinal seam automatic welding machine can be widely used in aerospace vehicles, pressure vessels, automotive parts, medical machinery, building decoration, household appliances, food machinery and other manufacturing industries wherever longitudinal seam welding is required.