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Weld Star A18 Mild Steel TIG Welding Rods 3.2mm – 5kg

£23.95 ex VAT

Further Reductions Available On Request 01276 505012

  • A18 ER70S-6
  • 5kg Pack – 3.2mm
  • Mild Steel
SKU: 3010300159 Categories: ,



AWS A5.18 – ER 70S-6

A 5kg Pack of A18 SG2 Steel TIG welding rods (3.2mm).  ER70S-6 is used for a wide variety of applications in many industries. This copper coated mild steel TIG wire has high levels of manganese and silicon which encourages stronger deoxidising capabilities. The key benefit is that there is less need for stringent cleaning procedures.

the increased amount of Silicon (Si) also promotes good levels of fluidity within the weld puddle. This results in a smoother bead appearance and a reduction in post weld grinding. Both Silicon (Si) and Manganese (Mn) play an important role in A18 SG2 filler rods by increasing mechanical properties such as strength, hardness and abrasion resistance, even achievable at sub zero temperatures as low as -40°C. Silicon (Si) itself also enhances resistance to hot cracking issues.

Applications typically include boilers, industrial machinery, bridges, shipbuilding, automotive, rail, structural and engineering fabrications.

Features & Benefits
  • Mild Steel TIG wire is considered an industry standard
  • Excellent deoxidising capabilities
  • Silicon creates good levels of fluidity in the weld puddle. Leading to a smoother bead appearance
  • Exceptional mechanical properties even at temperatures down to -40°C
  • Greater resistance to hot cracking
Industries / Applications
  • Structural and Engineering Fabrications
  • Boilers
  • Industrial Machinery
  • Shipbuilding
  • Automotive Sector
  • Rail
What’s the difference between A15 and A18 TIG Welding Rods?

The main difference between these two types of mild steel TIG filler wire is that A15 (ER70S-2) is more ductile allowing for the capacity to bend and misshape without compromising the structural integrity of the weld.  However, the weld pool doesn’t flow easily.  In contrast, A18 (ER70S-6) welding wire will have greater fluidity within the weld puddle due to the increased levels of Silicon (Si).  A18 wire does not have the same levels of ductility as A15.


Chemical Composition % (Typical)
C% Si% Mn% P% S% Cu%
0.07 0.85 1.45 <0.020 <0.020 <0.25
Cr% Ni% Mo% Al% V% Zr+Ti%
<0.15 <0.15 <0.050 0.200 <0.030 <0.15


Mechanical Properties
Tensile Strength 550 MPa
Yield Strength 450 MPa
Elongation >24%
Impact Strength >80 J
Test Temperature -40ºC

Mechanical properties are approximate and may vary based on the heat, shielding gas, welding parameters and other factors.


Shielding Gases

EN ISO 14175 – TIG: I1 (Argon)


Welding Positions

EN ISO 6947 – PA, PB, PC, PD, PE, PF


EN ISO 636-A – W 42 4 3Si1
AWS A5.18 – ER 70S-6
In Conclusion

These TIG rods exhibit excellent weld pool fluidity, greater resistance to hot cracking and deoxidising capacity. Considered an industry favourite and used for numerous applications. ER70S-6 wire has excellent mechanical properties due to the alloying elements mentioned above.

Image for illustration purposes only.


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