handbook-gas-shielding-38.html
AGA CW Handbook A4_32130-UK
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39 contents 9.1 shielding gases for
copper
and
copper
alloys
selection table 9.2 shielding gases for titanium and titanium
alloys
selection table 9.3. shielding gases for nickel-based
alloys
selection table 9.1 shielding gases for
copper
and
copper
alloys
copper
is very ductile. it also has a good corrosion resistance against many substances. the electrical and thermal conductivity of unalloyed
copper
is good, but with
copper
alloys
these properties are poorer. weldability varies greatly from one
copper
alloy to another.
copper
and
copper
alloys
are used extensively in electrical equipment, water pipelines, valves, heat exchangers and chemical equipment. mison ® ar shielding gas is recommended for the mig and tig
welding
of
copper
and
copper
alloys
. when thicker pieces are welded, argon-helium mixtures (mison ® he30, varigon ® he50, varigon ® he70) or pure helium can be used. the helium added to the shielding gas improves penetration and redu- ces the need for preheating. 9.2 shielding gases for titanium and titanium
alloys
titanium is often used due to its corrosion resistance or its good weight- strength ratio. in particular, the tensile strength and yield strength of titanium
alloys
are high. titanium and titanium
alloys
can be divided into different classes. the american astm classification system is the most commonly used. the most common unalloyed class is grade 2, which is intended for general applications. aluminium and zinc are used as
alloys
in so-called alpha
alloys
to improve strength. the most commonly used alpha alloy is grade 6, which is used in the space industry. beta
alloys
include, for example, vanadium, molybdenum and/or chromium. these
alloys
have the best strength properties. grades 19 and 21 are used extensively in the off-shore industry. high strength and corrosion resistance are typical for these classes, but they are difficult to weld. inert shielding gases must be used when
welding
titanium and titanium
alloys
. titanium reacts very easily with hydrogen, oxygen and nitrogen. for demanding applications, we recommend high-purity argon (over 99.996%), argon 4.6. shielding gases for other metals. shielding gases for
copper
and
copper
alloys
process filler shielding gas properties mig solid wire mison ® ar provides a more stable arc than argon or argon-helium mixtures. short arc spray arc pulse
welding
mison ® he30 general gas for
welding
thicker materials. spray arc better side penetration and higher
welding
speed due to the pulse
welding
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 increases. varigon ® he50 better penetration and higher
welding
speed. helium for
welding
thick materials. spray arc no ozone-eliminating properties. pulse
welding
tig with or without mison ® ar provides a more stable arc than argon or argon-helium mixtures. filler material. arc is easy to ignite. 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 increases. varigon ® he70 better penetration and higher
welding
speed. helium for
welding
thick materials. no ozone-eliminating properties. all mison ® shielding gases remove ozone generated during
welding
and improve the welder’s work environment. shielding gases for other metals
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