| Application:
Flat sheet and internal welding of road tanker tanks.
Material:
Stainless and carbon steels
Process:
Dual-ArcTM combined plasma and DC GTA (TIG) welding.
Capacity:
Sheets and cylinders up to 26 ft (8 m) long.
Flat sheets or cylinders with a minimum 48" (1,220 mm) diameter.
Material thickness up to 3/8" (10 mm).
Description:
Designed for flat sheet and internal welding, the seamwelder has a solid base providing a high degree of rigidity. The base structure is fitted with hydraulically operated centering devices. When operated, these devices move upwards and inwards until their front edge is on the seamwelder centerline. The sheet can then be aligned against these devices and clamped into position.
The tabletop is hydraulically elevated; this is designed to provide additional clearance for the loading and unloading of parts. A latch is provided to secure the tabletop against the clamping forces when it is in the lowered position.
The welding equipment is mounted on a powered carriage that rides on a heavy-duty track that has been stress-relieved and machined. Hardened vee-way tracks provide smooth carriage travel. The weld head has plasma and GTA (TIG) welding facilities, each mounted on an arc length control actuator. Cold wire feed and magnetic oscillation of the trailing GTA (TIG) welding torch produces a smooth bead on the top surface of the sheet while the plasma torch provides key-holing capability for full penetration of square butt plate edges.
The weld process is controlled from a remote control station. Video monitoring facilities give the operator a clear view of the weld area, before, during and after the welding operation.
The integrity of the welds is assured by the use of two 9500 microprocessor controls. The two controls are interconnected and work in harmony with each other to ensure complete control of the welding process. As the system is Dual ArcTM, it is necessary to control both the plasma keyhole and the TIG welding processes. The 9500 controls are capable of controlling up to eight weld process parameters, closed-loop control gives better than 1% accuracy of each parameter.
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