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Bohler Union ALSI 5 Aluminium TIG Welding Rod – ER4043

  • Weld with confidence knowing that you are using a high-quality filler metal from a trusted manufacturer
  • Produce welds that are both strong and beautiful
  • Reduce the risk of burn-through or warping when welding thin aluminium materials
  • Create welds that are resistant to corrosion and other environmental factors
  • Produce welds that can be anodized for a decorative finish


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Over 50 years welding expertise
Free delivery over £85 inc. VAT

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The Bohler Union ALSi 5 Aluminium TIG Welding Rod is a general-purpose filler metal for welding a wide range of aluminium alloys, including 3003, 3004, 5052, and 6061. It is a popular choice for welders due to its good fluidity, low melting point, and excellent corrosion resistance.

This rod is also compatible with anodising, making it suitable for applications where a decorative finish is required.


  • General-purpose filler metal for a wide range of aluminium alloys
  • Good fluidity for smooth, aesthetically pleasing welds
  • Low melting point for welding thin aluminium materials
  • Excellent corrosion resistance
  • Compatible with anodizing


  • General fabrication
  • Marine and shipbuilding
  • Aerospace
  • Structural welding
  • Architectural applications


Description Part No.
Union ALSI 5 1.6 x 1000mm 2.5kg 85108
Union ALSI 5 2.4 x 1000mm 2.5kg 85118
Union ALSI 5 3.2 x 1000mm 2.5kg 85119


Additional information




AWS Class


EN ISO Class

S Al 4043A (AlSi5(A))


1.6mm , 2.4mm , 3.2mm


Click and Collect:
Free Click and Collect with no minimum spend from our warehouse on the Empress Park, Southampton with on-site parking. Once your order has been processed, we will advise you when it is ready for pickup.  Just want advice?  No problem.  Feel free to call in to speak to one of our friendly experts.

EWS Fleet Coverage Areas: 
Southampton | Eastleigh | Winchester | Alton | Farnham | Petersfield | Havant | Hayling Island | Waterlooville | Fareham | Portsmouth | Gosport | Chichester | Arun | Worthing | New Forest | Christchurch | Salisbury | Wiltshire | Test Valley | Basingstoke and Deane | West Berkshire | Reading | Hart | Waverley | East Hampshire | East Dorset | Hampshire | Bournemouth | Poole | Lymington | Ringwood | Verwood | East Preston | Goring-by-Sea | Lancing | Shoreham-by-Sea | Steyning | Bramber | Horsham | Adur

Nationwide Delivery (all items excluding gas cylinders):
Free UK mainland (England, Scotland and Wales) delivery on orders over £85 inc. VAT.
UK mainland delivery is £7.50 inc. VAT on orders under £85 inc. VAT.
UK islands and Northern Ireland shipping costs may vary.

UK Delivery for Gas Cylinders:
Shipping costs for gas cylinders are calculated at checkout once the delivery postcode is entered.

International Delivery:
Please contact us for an accurate delivery quote.



EN ISO 18273: S Al 4043A (AlSi5(A))

AWS A5.10: ER4043

Bohler Union ALSI 5 Aluminium TIG Welding Rod - ER4043

Bohler Union ALSI 5 Aluminium TIG Welding Rod – ER4043

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