Suffolk Iron Foundry, est. 1900s
A century of welding consumables
The flagship. SIF is the consumables brand that built its reputation on SIFbronze, and has supplied the British welding trade for over a century.
01 — About SIF
Origin
SIF began life as the Suffolk Iron Foundry, and it was here that SIFbronze welding was developed: the low-temperature bronze-welding process that fabricated everything from Jaguar's Le Mans-winning chassis to wartime aircraft.
Range
Today the SIF range is the backbone of the catalogue: TIG filler rods, MIG wires, MMA electrodes, brazing rods and fluxes across mild and low-alloy steel, stainless, aluminium, copper, cast iron and hardfacing, under the SIFMIG, SIFSTEEL, SIFTRODE and SIFBRONZE ranges.
Backing
Every consumable ships with a REACH-compliant safety data sheet, and the trade counter is backed by a field sales team that knows the metallurgy as well as the catalogue.
Established
Suffolk Iron Foundry, est. 1900s
01
Heritage
The home of SIFbronze, and a maker of welding consumables since the early 1900s.
02
Breadth
Filler wires, electrodes, brazing rods and fluxes for every process and material.
03
Compliance
A REACH-compliant SDS on every consumable, ready to download.
04
Technical support
A field sales team that advises on classification, not just stock.
02 — The SIF range
Wrong filler, and the joint fails quietly, weeks later, in service. Twelve starting points across the four SIF ranges (SIFMIG, SIFTIG, SIFTRODE and SIFBRONZE), each a range page covering every diameter and grade, and each with a REACH-compliant safety data sheet to download.
MIG Mild steel SIFMIG Mild Steel Welding Wires The wire that's on every van, every day. The everyday MIG wire for mild and low-alloy steel, in SG2, SG3, A15, A31 and A32 grades from 0.6mm to 1.2mm. View range 
MIG Stainless SIFMIG Stainless Steel Welding Wires For welds that still have to look right at 400°C. The full stainless MIG range in one place: 308LSi, 316LSi, 309LSi, 347, 310, 312 and 2209 duplex. View range 
MIG Aluminium SIFMIG Aluminium Welding Wires Soft wire, fussy feed. Get the alloy right first. The 4043 and 5356 aluminium MIG wires, across the spool sizes and diameters that suit a push-pull or a short liner. View range 
TIG Mild steel SIFTIG Mild Steel Welding Rods The rod you reach for when it just has to be clean. The everyday TIG rod for mild and low-alloy steel, in A15, A18, A31, A32 and A33 grades from 1.0mm to 3.2mm. View range 
TIG Stainless SIFTIG Stainless Steel Welding Rods Built for the heat a furnace actually puts out. Austenitic and duplex stainless across the full diameter spread: 308L, 309L, 310, 312, 316L, 347 and duplex 2209. View range TIG Aluminium SIFTIG Aluminium Welding Rods Where the filler choice shows in the finished bead. 4043 and 5356 aluminium TIG rods, the two alloys that cover most wrought and cast aluminium work. View range 
MMA Mild steel Mild Steel MMA Welding Electrodes — 6013, 7016 & 7018 Low hydrogen: the number that matters on structural work. 6013 for easy general-purpose runs, 7016 and 7018 low-hydrogen for stronger, crack-resistant welds. Vacuum packed. View range 
MMA Stainless Stainless Steel MMA Electrodes — 307/308L/309L/312/316L Stick, on stainless, without ruining the corrosion resistance. 307, 308L, 309L, 312 and 316L stainless electrodes, vacuum packed to keep the coating dry. View range 
MMA Cast iron SIFTRODE NiFe Cast Iron MMA Electrodes For the casting nobody wants to write off. SIFTRODE NiFe nickel-iron electrodes for repairing and rebuilding grey and ductile cast iron. View range 
MMA Hardfacing SIFTRODE HF-600 Hardfacing Electrodes Put the wear surface back instead of buying the part again. SIFTRODE HF-600 hardfacing electrodes for building up and protecting surfaces that abrade. View range 
Since the 1900s Brazing The original SIFBRONZE Alloy Brazing Rods The rod SIF was built on, and still the trade's first call. The original brazing alloys for steel, cast iron, copper and dissimilar joints: C2, CP2, CP3, CP4 and Proprietary 101. View range 
Brazing Flux SIFBRONZE Flux (500G Jar) The half of the job that's easy to forget. Powder flux for general brazing that cleans the joint and stops it oxidising, built to run with SIFBRONZE rods. View range 03 — Find your filler
Pick your parent material and your process. Every answer below is quoted from the alloy-selection charts in the 2026 SIF Consumables Handbook, the same charts the free PDF prints in full.
The handbook's charts don't carry a MIG recommendation for aluminium. Try another process, or talk to the field sales team, because for this combination the answer depends on the specific grade and the joint.
The handbook's charts don't carry a MMA (stick) recommendation for copper & bronze. Try another process, or talk to the field sales team, because for this combination the answer depends on the specific grade and the joint.
The handbook's charts don't carry a MIG recommendation for tool & die steel. Try another process, or talk to the field sales team, because for this combination the answer depends on the specific grade and the joint.
The handbook's charts don't carry a MMA (stick) recommendation for tool & die steel. Try another process, or talk to the field sales team, because for this combination the answer depends on the specific grade and the joint.
These are the handbook's recommendations, not a welding procedure. Every chart in full (including the parent materials not listed here) is in the free SIF Consumables Handbook. For dissimilar metals, a coded procedure, or a parent material you can't identify, speak to the field sales team before you buy.
04 — The consumables handbook
141 pages: a datasheet for each of the 96 consumables in the range (composition, mechanical properties, standards and the part number for every diameter), plus 17 pages of charts that take you from parent metal to filler, current and gas. Free PDF.
Get the handbook05 — A century in the field
Browse the archiveSIFbronze fabricated Jaguar's Le Mans-winning chassis and wartime aircraft in the last century. SIF Tips, the trade's welding quarterly, ran for 41 years, with 76 issues between 1932 and 1973, one from each decade below.
06 — Common questions
Yes. Every consumable in the SIF range ships with a REACH-compliant safety data sheet, and you can download it from the product page before you order, with no account or request needed.
They are the four SIF families, split by process. SIFBRONZE is the original low-temperature bronze brazing alloys. SIFMIG is the MIG wire range, SIFTIG the TIG filler rods, and SIFTRODE the MMA stick electrodes, including the cast-iron and hardfacing grades.
Start with the filler finder above: pick your parent material and your process and it quotes the selection chart from the SIF Consumables Handbook, including the current range and shielding gas. For anything unusual (dissimilar metals, a coded procedure, an unknown parent material), talk to the field sales team rather than guessing.
No minimum order value, and UK delivery is free over £150 for trade accounts. A few lines carry a minimum order quantity, which is shown on the product page.
Weldability SIF sells to the trade only, so you will need an approved account to order. Applying takes a few minutes and the catalogue, datasheets and specifications are all open to browse in the meantime.
Your SIF contacts
Open an account
Trade-only No minimum order Free UK delivery over £150. Request an account and get access to the full range.