Package for Submerged Arc-Welding Flux Handling

Bigbag is a 1,000kg bulk package for the efficient handling of high-quality submerged arc-welding fluxes. It can be placed over the flux hopper by crane or in a frame and can be quickly discharged when a refill of the hopper becomes necessary. The discharge spout of the Bigbag is thermally sealed but is easy to open without the use of knives, scissors or other tools. The moisture protection of fully filled Bigbags was tested in a climate chamber for five weeks.

The climate conditions in weeks one to four were 35C/90 per cent relative humidity, corresponding to average tropical conditions. In week five, the dew point was artificially reached once a day and droplets appeared on the outer packaging. Two sets of flux samples for moisture testing were taken from the centre of the Bigbag and two sets from the side and test proved that no measurable moisture absorption takes place. Although it takes only about one minute to empty a complete Bigbag, small- or large-volume users can choose to take out any volume of flux at a time by closing the well-defined discharge spout during the flux flow.

In this way, time savings can be obtained compared with refilling from 20-30kg flux bags or buckets. Another important saving lies in the protection of the flux from moisture absorption. Bigbags are made from strong woven polypropylene material that has an internal multi-layered aluminium lining, keeping the flux 'factory dry'. Fabricators may decided to use the flux without re-drying, even in hot and humid environments. Each pallet of flux is additionally protected against moisture by wrap or shrink foil. The complete empty Bigbag, including the aluminium liner, is disposed as combustible energy recycling material, according to EN 13431.

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