ESAB Welding & Cutting Products has introduced PIPEWELD 78LH FLUX, a low hydrogen flux for longitudinal or spiral welding of pipeline steel grads, using multi-wire submerged arc welding processes.

A new flux formulation and production process enables PIPWELD 78LH FLUX to meet the H4 classification of ≤ 4ml of diffusible hydrogen per 100g of weld metal as produced.

The product’s low hydrogen formulation and moisture resistance enables coating within a few hours after welding, improving throughout.

“ESAB tested PIPEWELD 78LH versus competitive fluxes and the previous version of OK Flux 10.77 and proved that it reduces moisture pick-up and diffusible hydrogen levels,” said Halinson Campos, Product Business Manager of Filler Metals, ESAB.

The flux has been specifically designed for multi-wire submerged arc welding processes, such as twin-wire, tandem or ESAB’s patented Integrated Cold Electrode (ICE™).

By feeding an electrically cold electrode into the weld puddle, ICE increase deposition rate without increasing heat input to help preserve mechanical and metallurgical properties.

“A low transition angle between the weld crown and base plate prevents over-welding and the associated waste of filler metal, as well as cost saving in the later pipe coating operation, since the coating thickness can be reduced,” said Campos.

“PIPEWELD 78LH also provides a smooth surface finish, even at high welding speeds. Because of its improved grain size, PIPEWELD 78LH can be recaptured and reused, prolonging the interval between flux hopper refills,” Capos continued.

H4 classification is guaranteed when users receive the flux in an ESAB BigBag package, a 2,000- to 2,200-lb bulk package made from a woven polypropylene material with a multi-layers aluminium lining that keeps moisture away during storage.

ESAB PIPEWELD 78LH is also available in a 50-lb. Flux Pack™, which uses a thick LDPE material.