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AGA CW Handbook A4_32130-UK
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37 8.2 choosing the shielding gas for aluminium inert gases are used in the gas
arc
welding
of aluminium. the most used shielding gas is
mison
® ar, which also reduces the amount of ozone generated during
welding
. ozone is a large problem in the mig
welding
of aluminium, during which very large amounts of ozone is generated. for this reason, all available means of reducing ozone exposure are necessary. the standard gas for
welding
thin materials is
mison
® ar. if you wish to increase penetration or
welding
speed with thicker mate- rials, you can use shielding gases with a helium content (
mison
® he30, varigon ® he50, varigon ® he70). aluminium shielding gases process filler material shielding gas properties mig solid wire
mison
® ar provides a more stable
arc
than argon or argon-helium mixtures spray
arc
pulse
welding
mison
® he30 general gas for
welding
thicker materials. spray
arc
better side penetration and higher
welding
speed due to pulse
welding
the helium mixture. varigon ® he50 as the amount of helium increases, heat transfer to the varigon ® he70 weld also in creases. better penetration and higher
welding
speed. spray
arc
for
welding
thick materials. pulse
welding
no ozone-eliminating properties. tig with or without filler material.
mison
® ar provides a more stable
arc
than argon or argon-helium mixtures.
arc
is easy to ignite. better penetration than with argon.
mison
® he30 general gas for
welding
thicker materials. better side penetration and higher
welding
speed due to the helium mixture. varigon ® he50 as the amount of helium increases, heat transfer to the weld also varigon ® he70 increases. better penetration and higher
welding
speed. for
welding
thick materials. no ozone-eliminating properties all
mison
® shielding gases remove ozone generated during
welding
and improve the welder’s work environment. ozone generation rates when
welding
different base materials. stainless steel tig argon aluminium tig argon aluminium tig helium unalloyed steel mag carbon dioxide short
arc
unalloyed steel mag ar+20% co 2 short
arc
unalloyed steel mag ar+20% co 2 spray
arc
aluminium mig argon spray
arc
12 11 10 9 8 7 6 5 4 3 2 1 ozone generation rate (ml/min) ozone generation rate (ml/min) aluminium shielding gases
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