BOC Smootharc Multi 180 - Shielding Gases and Welding Wire; Recommended Shielding Gases by Material; Recommended Welding Wire

Shielding gases
Material Shielding gas Benets
Brass Argon Stable arc
Low fume
Cobalt-based alloys Argon Stable and easy to control arc
Copper-nickel
(Monel)
Argon Stable and easy to control arc
Can be used for copper-nickel
to steel
Deoxised copper Helium Increased heat input
Stable arc
Good penetration
Helium(75%)
/Argon(25%)
Stable arc
Lower penetration
Nickel alloys
(Inconel)
Argon Stable arc
Manual operation
Helium High speed automated welding
Steel Argon Stable arc
Good penetration
Helium High speed automatic welding
Deeper penetration
Small concentrated HAZ
Magnesium alloys Argon Used with continuous high
frequency AC
Good arc stability
Good cleaning action
Stainless steel Argon Good penetration
Good arc stability
Helium Deeper penetration
Titanium Argon Stable arc
Helium High speed welding
Welding wire
The following table includes the recommended welding consumable for
the most commonly weldedmaterials.
Base material BOC consumable
C-Mn and low carbon steels BOC Mild steel TIG wire
Low Alloy steels
1.25Cr/0.5Mo Comweld CrMo1
2.5Cr/1Mo Comweld CrMo2
Stainless Steel
304/304L Proll 308
316/316L Proll 316
309/309-C-Mn Proll 309
321/Stabilised grades Proll 347
Filler rod diameter (mm) Thickness of metal (mm)
2 0.5 – 2
3 2 – 5
4 5 – 8
4 or 5 8 – 12
5 or 6 12 or more
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BOC Smootharc Multi 180/200 Operating manual