26/09/2018    www.weldability-sif.com    Weldability | Sif    sales@weldability-sif.com    0845 130 7757

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Weldability Sif Technical Knowledge Database

Welcome to the Weldability Sif Technical Knowledge Database. We answer many technical questions daily in assisting customers with selecting and using our products in their applications. You can search these questions using the box below, to find the answers you seek.





A selection of popular questions and their answers:


A. SIFSILCOPPER No 7HQ


A. 6026 is a high-purity aluminium alloyed with 1.0 manganese, 1.2 magnesium, 1.4 silicon and 0.5 copper. It provides 360MPa UTS. SIFMIG 5556 or SifAlumin No37 are suitable welding alloys for use with this material, to provide comparable UTS.


A. For good colour match use Sifphosphor Bronze No 82


A. Materials can be welded using Sifalumin No.15 and also Sifalumin No.16


A. Rod to use would be Sifalumin No.27 if the joint is not structural with no strain on it.


A. Wrought iron is an iron alloy with a very low carbon content and has fibrous tiered slag inclusions. Wrought Iron bends better than mild steel and is very corrosion resistant, hardly rusting over long periods. It is tough, malleable, ductile and easily welded, but the slag inclusions make it extremely difficult to obtain a porosity-free and crack-free weld.

When welded, it is often tackled in MMA, as most wrought-iron still in-situ is in the external environment.

If you are surface-repair welding and don't require a perfect result, then a 6013 electrode will suffice.

If you need a weld of higher-quality, through the grain, you must use a 7016 electrode and repeatedly weld, grind back to clean metal, weld again, until you get a weld of acceptable appearance. Metallurgically it wont be sound in the same way as we are used to with mild steel, but it will probably be stronger than the wrought iron itself.


A. Solar-powered photovoltaic technology is now quite mature in the welding sector, and is widely used across most brands of auto-darkening filter ADF welding helmet. All ADF welding helmets have a battery of some kind, but those not marketed as battery-powered or battery-assisted tend to be categorised as solar-powered and depend on a low-voltage rechargeable cell, which is topped-up by the photovoltaic panel to provide an acceptable service life. Weldability Phantom XL, is battery-assisted and includes a lithium coin or similar cell to increase the voltage and therefore improve the performance of the ADF. Performance improvement in battery-assisted models is evident through greater sensitivity lower minimum current reactivity, faster switching speed and better reliability. However, this improved technology and performance tends to mean the ADF helmet is at a slightly higher weight and cost.


A. Material can be Tig brazed using Sifphosphor Bronze No.8


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