Twin-wire system speeds cladding processes
A novel twin-wire system doubles the deposition rate in weld overlay cladding processes.
Arc Energy's recently created R and D department has announced its first innovation with the development of a new twin-wire system for its weld overlay cladding (WOC) processes.
The twin-wire system introduces a second consumable wire into the welding process, immediately doubling the deposition rate.
It has also proved to enhance dilution figures, as the increase in wire acts as an additional heatsink within the weld pool, giving quicker solidification times and thus reducing the heat affected zone.
Parameters are carefully controlled to ensure that good fusion is maintained while keeping the pool as small as possible.
Commenting for Arc Energy, QA and Welding Engineering Manager Peter Minett says: "For companies specialising in WOC, reducing production time is an obvious advantage to customers.
Needless to say, the biggest influence on cladding production time is the rate at which the material can be deposited".
Putting quantities and deposition rates into perspective, Minett explains that a 2.8m-long vessel with a diameter of 950mm being clad with a 4mm thickness of material, will take almost 300kg of alloy.
The conventional GTAW process would deposit the alloy at a rate of just over 1kg/h.
The new twin-wire system almost doubles this deposition rate, providing obvious savings in production time.
Having qualified the weld procedures in accordance with ASME IX, the twin-wire process has been successfully used to clad the total outer surface of a 72in-diameter valve ball.
The fact that the twin-wire process is suitable for vertical and horizontal deposition also meant that the valve ball didn't need to be moved continually to allow for its shape.
This contributed to the significant reduction in timescale as the surface could be clad in just two settings.
As with many applications in the oil and gas industry, delivery of the valve ball was critical.
Using the standard GTAW process to clad the valve ball would have taken up to four weeks to complete but, by using the new twin-wire process, Arc Energy was able to reduce this to just over two weeks.
Summing up, Minett says weld overlay cladding remains the most versatile form of heavy-duty metallic protection against corrosion, not only in oil and gas but in other industries that experience long term degradation of fluid carrying systems.
Now, with the development of the Arc Energy twin-wire system, it is also able to meet the demand for faster turnaround on vital pipeline equipment such as valves, fittings and associated components.
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