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Weld Star A30 TIG Welding Wire (ER 70S-A1) 1.6mm 5kg

£56.00 ex VAT

Further Reductions Available On Request 01276 505012

  • A30 TIG Welding Wire
  • UKCA Approved
  • 1.6mm 5kg
SKU: 3010300421 Categories: ,




A 5KG pack of Weld Star 1.6mm A30 TIG Welding Rods for low alloy steel . Copper coated and heat resisting designed specifically for welding low alloy creep resistant steels which require high tensile strength.

The addition of the chemical element Molybdenum (Mo-0.5%) enhances toughness at elevated temperatures. It also improves machinability and corrosion resistance. A30 filler wire produces a weld deposit that is highly resistant to cold cracking (sometimes referred to as hydrogen induced cracking or simply hydrogen cracking).  This is because hydrogen can become trapped in both the weld and the heat affected zone resulting in this form of cracking.

Recommended working temperature of up to 500°C. Typical uses include creep steels for construction steam boilers, pressure tanks, gas pipes, shipbuilding sector, petrochemical industry, heat exchangers, building of cranes and bridges. Weld Star A30 (ER 70S-A1) Low Alloy Steel TIG Wire establishes uniform copper bonding with a low total copper content of <0.25%.

Excellent mechanical properties include a tensile strength of 610MPa and yield strength of 520MPa.  As a result of the difference between these two figures, the ductile nature of the wire is increased.  This is exhibited by its ability to endure twisting, misshaping and deforming without affecting the integrity of the finished weld. The high level of impact strength ensures a good ability to withstand a sudden force without affecting the weld and base material.


Features & Benefits
  • The Weld deposit is highly resistant to cold cracking (sometimes known as hydrogen cracking).
  • Improved machinability and corrosion resistance.  This is due to the addition of 0.5% Molybdenum within the wire.
  • Excellent tensile and yield strength. Ensuring excellent ductile properties.
  • Solid toughness even at working temperatures upto 500°C.
  • Established uniform copper bonding with low copper content of <0.25%.
  • Designed specifically for welding low alloy creep resistant steels.
What is creep resistance?

The term creep resistance refers to materials used in machines and facilities that are required to withstand high temperatures and high operating loads. Creep resistant materials must be able to withstand the effects of high temperature corrosion. Furthermore, the term Creep can sometimes be referred to as cold flow.  Creep management is used in fields and applications such as nuclear power plants, jet engines, refineries, and high capacity kilns.


What is the ER 70S-A1 Classification?

This is broken down into the following components: ‘ER’ is the abbreviation electrode or in this case filler wire. This is followed by the number 70 which represents the minimum tensile strength, in this case 70,000 PSI (Pounds per Square Inch). The ‘S’ indicates the wire is solid.  This may sometimes be represented as ‘C’ which advises the welding wire form is a composite.  Finally, the ending letter/number combination (in this case A1 – Aluminium) refers to the amount of deoxidising agents added to the wire.


Suitable for the following applications and industries:

  • Heat Exchangers
  • Building Cranes and Bridges
  • Petrochemical Industry
  • Marine Engineering and Shipbuilding
  • Gas Pipes
  • Pressure Tanks
  • Construction Steam Boilers
  • Nuclear Power Plant
  • Refineries

The above applications are not an exhaustive list.


Chemical Composition % (Typical)
C% Si% Mn% P% S% Cu%
0.09 0.60 1.20 <0.015 <0.015 <0.25
Cr% Ni% Mo% Al% V% Zr+Ti%
<0.15 <0.10 0.50 <0.030 <0.020 <0.050



Mechanical Properties (Typical)
Tensile Strength 610 MPa
Yield Strength 520 MPa
Elongation 25%
Impact Strength 150 J  >47 J
Test Temperature +20ºC  -40ºC

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


EN ISO 636-A – W 2Mo
AWS A5.28 – ER 70S-A1
Shielding Gas

EN ISO 14175 – TIG: I1 (Argon)

Typical Base Materials

P295GH, P355GH, 16Mo3, 17Mo3, 14Mo6, S275, S355, S420, A210, A285, A335, A516, S275Ml, S355M, S420M, S460 15Mo3, 10MnMo45, 11MnMo45, GS60, GS22Mo4, 20MnMoNi5-5, 15NiCuMoNd5S, 17MnMoV64*
* Illustrative, not exhaustive list

In Conclusion

A30 TIG Filler Wire has excellent mechanical properties including tensile strength and impact resistance.  Combined with the ability to withstand high temperatures and intense levels of corrosion without compromise.  Specifically designed to be used in the process of welding creep resistant low alloy steels.  For working temperatures up to 500°C. Attractive uniform copper bonding even with a copper amount as low as <0.25%.

Green wire is produced using virgin raw materials sourced from specialised steel mills, which ensures consistent reliability and quality.

Wire images are for illustration only.


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