mechanised and orbital tig

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CASE STORYFrom Soldering to Welding – Orbital TIG-welding of Cunifer pipes at Finnish shipyardDescriptionOne material often used in a modern ship is coppernickel alloys – traditionally considered to be ratherdemanding due to thermal properties of copper.It is difficult to get a stable weld-pool and weld withouta lack of fusion. Those problems belong to yesterdayat Kvaerner Masa-Yards (KMY) in Finland – OrbitalTIG welding was the key to improved quality andincreased productivity in welding of copper-nickelpiping.Material thickness is less than 3.0 mm. Combined withthe customer requirements of having an easilymovable equipment, an ESAB power source with awater-cooled welding head PRB 33-90 were chosen.Productivity data• The pre-programmed parameters can easily berecalled from the memory of the power source.• Compared with the soldering which was theprocess earlier used, the threshold in making ajoint has lowered significantly. To solder a jointtook almost 30 min to complete and one couldnever be quite sure of the finished quality.• With Orbital TIG welding the arc time isapproximately 1 minute on a Ø60 mm pipe and thequality can easily be controlled.Welded cunifer pipe. Diameter 60 mm and wall thickness 3.0 mmAdvantages• Improved weld quality and reduced work time.• More safe – open flame when soldering inside ashiphull is always a safety hazard – TIG arc waswelcomed by the shipyard fire-squad.• Easy to operate. More welders are now able tomake high quality weldments.• The shipyard has welders from different nations –the programming menu can be changed to differentlanguages just by pressing some buttons.
CASE STORY – contribution by Derek Harvey, ESAB UKCladding valves for the offshore marketDescriptionThe offshore market is very demanding in the claddingarea and ESAB equipment was chosen due to its easyuse and compactness. Quality and reliability were alsoimportant, as well as accurate control over all weldingparameters.The welding head is mounted on a small column andboom, and the workpiece on a turntable, driven by theVEC motor, which is controlled by the power source.Our customer manufactures his own hot wire system,which is connected to the wire at the outlet nozzle.A number of systems have been supplied to date andare performing well in production.Contents• ESAB power source• A25 welding head with AVC, weave and wire feed• VEC motor for rotating a turntable• A6 manual slide for coarse position the weldinghead in X and Y plainsAdvantages• Easy to use and compact• Quality and reliability• Accurate control over all welding parametersA25
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mechanised and orbital tig

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