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Brand: Böhler Welding
Böhler UV 418 TT Fluoride-Basic Submerged Arc Flux
Description
High-basicity flux for fine-grained structural steels and 2-run procedures
Böhler UV 418 TT is an agglomerated fluoride-basic flux for submerged arc welding of a wide scope of unalloyed and low-alloyed steel grades. Böhler Welding gives it a high basicity and neutral metallurgical behaviour and designs it for medium and high strength, fine-grained structural steels. The data sheet states very good toughness at -75 °F (about -59 °C) and CTOD values at -20 °F (about -29 °C), in both as-welded and PWHT condition, and an excellent bead appearance with very good slag release, even in narrow-gap joint preparations.
Technical specifications
| Parameter | Specification |
|---|---|
| Flux type | Agglomerated, fluoride-basic, for low and medium alloy wires |
| Classification EN ISO 14174 | S A FB 1 55 AC H5 |
| Polarity | DC / AC |
| Basicity index (Boniszewski) | 2.6 wt % |
| Grain size (EN ISO 14174) | 3 to 20 (0.3 to 2.0 mm) |
| Flux consumption | 1.0 lb flux per lb of wire |
| Redrying | 620 °F ± 45 (about 325 °C) for at least 2 hours |
| Diffusible hydrogen (ISO 3690) | Max 5 ml per 100 g (as produced and re-dried) |
| Composition, wt % | SiO2 + TiO2 15; CaO + MgO 38; Al2O3 + MnO 20; CaF2 25 |
| Approvals as printed on the Böhler webshop | ABS, DNV-GL |
Two-run welding and wire choice
Thanks to its high current-carrying capacity, UV 418 TT is well suited to 2-run procedures with unalloyed and low-alloyed wires, the data sheet naming Union S 2 Mo and Union S 3 MoTiB as examples, with very good toughness. Its consumption of 1.0 lb flux per lb of wire is lower than that of some other Böhler fluxes. For the plain C-Mn wires and , the Böhler wire data sheets list UV 418 TT among their recommended fluxes. Fabricators of pressure vessels, offshore structures, storage tanks and wind-tower sections use this class of flux where low-temperature impact values are specified.
| Related Böhler flux | EN ISO 14174 class | Intended for |
|---|---|---|
| UV 420 TTR-W | S A FB 1 65 AC H5 | Cr-Mo wires, long PWHT, AC welding |
| UV 400 | S A AB 1 67 AC H5 | General structural, boiler and pipe steels |
| Marathon 543 | S A FB 1 55 DC H5 | P91 / P92 multi-run welding |
Handling, redrying and recycling
Agglomerated fluxes pick up moisture from humid air, and moisture becomes diffusible hydrogen in the weld. Redry opened or damaged bags at the temperature on the data sheet, store the flux in a heated hopper or cabinet at the machine, and keep recycled flux free of mill scale, slag fragments and dust by sieving and blending it with fresh flux. In a hot, humid climate the same discipline applies even more strongly, because a bag left open on the shop floor overnight can lose its low-hydrogen quality. Good flux handling matters most on high-strength steels, where hydrogen cracking risk is highest.
Documents and quotation
The Böhler Welding product data sheet for UV 418 TT (US edition, 03/2021) can be downloaded from this page. Confirm wire grade, polarity, joint design, impact temperature and PWHT before ordering, and keep the flux dry as instructed. Other products are in the Submerged Arc Fluxes category. For a quotation, send quantity, packaging and certificate needs.
Datasheets & Documents
- Datasheet Böhler Welding UV 418 TT product data sheet (US edition, 03/2021) Download
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About brand
Böhler Welding is the welding consumables brand of voestalpine Böhler Welding, part of the voestalpine group, with a portfolio that covers stick electrodes, TIG rods, solid wires, gas-shielded and self-shielded flux-cored wires and submerged-arc wires and fluxes. The company states more than 100 years of experience. Seven Star LLC, an independent supplier in Muscat, lists Böhler Welding consumables and welding machines, including pipeline electrodes, and sources Böhler Welding consumables for fabricators and pipeline contractors.
Böhler Welding product groups
Beyond the consumables above, Böhler Welding lists strip cladding, wire arc additive manufacturing, metal powders, arc spraying cored wires, ceramic weld backing, brazing consumables and welding automation such as orbital welding and collaborative robots. The pipeline range includes cellulosic FOX CEL electrodes and basic vertical-down FOX BVD electrodes for large-diameter line pipe.
Ordering Böhler Welding consumables: what we need
Give the product name, the AWS or EN classification, the diameter and length, and the packaging you need. For pipeline electrodes also state the pipe grade, wall thickness, welding position and whether sour-service test values are required, because the Böhler Welding data sheets note that some test values are available on request.
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Frequently Asked Questions
What type of flux is UV 418 TT?
An agglomerated fluoride-basic flux, class S A FB 1 55 AC H5.
What steels is it designed for?
Unalloyed and low-alloyed steels, especially medium and high strength fine-grained structural steels.
Which polarity is allowed?
DC and AC.
What toughness does the data sheet quote?
Very good toughness at -75 °F and CTOD values at -20 °F, as welded and after PWHT.
How is the flux redried?
620 °F ± 45 for at least 2 hours.
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