BOC Smootharc TIG185 AC/DC, Operating Manual

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2.4 Shielding gas selection
Material Shielding gas Benefits
Aluminium Alloys Argon Used with high frequency AC
good stable arc
good cleaning action
Argon/Helium Used with high frequency AC
good cleaning action
higher welding speed
increased penetration
Aluminium Bronze Argon Reduces penetration during
surfacing minimising dilution
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
2.5 Welding wire selection
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 Profill 308
316/316L Profill 316
309/309-C-Mn Profill 309
321/Stabilised grades Profill 347
Aluminium
1000 series Comweld 1100
5000 series Comweld 4043/4047/5356
6000 series Comweld 4043/4047/5356
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
10 BOC Smootharc TIG 185 AC/DC Operating Manual