Technical Knowledge Database

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Welcome to the Weldability Sif Technical Knowledge Database. We frequently answer technical questions while assisting customers with selecting and using our products in their applications. You can search these questions using the form below.

A selection of recent questions and their answers:

For good colour match use Sifphosphor Bronze No 82
Depending on the physical size of the components the type of brass involved and the final use of the item being brazed there is more than one option for these types of application Sifbronze No.1 Sifbronze No.101 or SIF Silver Solder can be used for joining these materials together. Remember to apply the correct flux for the product chosen.
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.
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.
Use Sifsteel stainless 312 in cases of extreme temperature, -50 deg C. Preheat is required to assist with penetration and to avoid stress cracks occuring during cooling.
Note, Sifphosphor Bronze No8 would normaly be used for its mechanical properties at ambient temperatures, above 0 C.
Use Sifmig No 8 wire.
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.
Disclaimer: This information is provided 'as is' and we accept no responsibility for the accuracy or validity of this information.