Product category:
Arc welding equipment, manual and automatic
News Release from: TPS-Fronius | Subject: MAG-TimeTwin process
Edited by the Manufacturingtalk Editorial
Team on 06 June 2003
Economical welding of plated sheets
An innovative method of welding corrosion-resistant composites now ensures a much higher level of cost-effectiveness in the plating of steel sheets
The plating of steel sheets has gained more and more importance, not only in the field of chemical equipment engineering, but also in environmental and offshore technologies, as well as in container construction In addition to economic advantages compared to solid material, an innovative method of welding corrosion-resistant composites now ensures a much higher level of cost-effectiveness
This article was originally published on Manufacturingtalk on 24 Jan 2003 at 8.00am (UK)
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Lightweight TIG welders offer high performance
More compact performance, lower noise level, more stable arc and easier operation than conventional welding devices are the features of lightweight TIG welding machines weighing just 15kg.
Firstly, the welder applies the similar-type unalloyed carrier material.
The user can use his innovation to fill the groove remaining in the acid-resistant cladding layer, using the powerful MAG-TimeTwin process.
Welding tests carried out at Fronius International Austria clearly showed that the thus created surface quality has a corrosion resistance comparable with that of the clad material.
Further reading
Power on - weld spatter gone
Because electromagnetic forces in a cleaner system remove the spatter from welding torch nozzles there is no need to use mechanical milling or reaming devices that might damage the nozzles.
Intuitive welding user guidance given remotely
The welding process can now be controlled in a new way, conveniently and yet still safely - in the place which is best for the user, for example next to the welded component.
The welding of two wire electrodes using the MAG-TimeTwin process, which is a variant of tandem welding, provides for profitability thanks to both high deposition rates and welding speeds.
Recent welding tests have proved that the process is suited for corrosion-resistant deposited materials, such as the highly acid-resistant alloy B2.
The thicker the steel sheets that are coated with this alloy, the greater the savings in terms of costs - up to 80% - compared to the solid material.
When welding the plated sheets, the workers add the substrate first.
Subsequently, the filler metal is inserted into the remaining groove between the approx.
4 mm thick platelayers, using the fully mechanised TimeTwin process (Supplementary Plating).
Specialists have optimised the welding parameters for alloy B2, provided that the groove filling is performed in three similar layers with a two-bead covering layer.
Thanks to the multiple-layer construction, the dilution ratio is kept to a minimum.
Thus, the final covering layer, which is in contact with the medium, consists of almost pure filler metal and the resistance to corrosion remains preserved.
Tests carried out with aggressive hydrochloric acid have proved that the surface quality of the groove filling is as acid-resistant as the alloy B2.
The TimeTwin-process melts both wired electrodes almost without spatter.
With regard to the welding seam, hardly any difference can be observed from the manual TIG process.
By analogy, this can also be applied to the excellent centreline solidification cracking behaviour of the supplementary plating.
However, up to 8 kg /h deposition performance and welding speeds of up to 70 cm/min speak in favour of the Time-Twin-process.
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