welding-gas-shielding-16.html
AGA CW Handbook A4_32130-UK
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17 the effect of shielding
gas
on productivity an example of cost savings achieved by changing the shielding
gas
: changing the shielding
gas
increased
welding
speed
and reduced the amount of post-weld finishing work. the achieved 30% increase in productivity lowered the total costs by 21%. 4.3.2
welding
speed
and and deposition rate one reason for the reduction of total
welding
costs is the increased
welding
speed
achievable with
gas
mixtures. carbon dioxide does not allow as high a
welding
speed
, because the weld bead will become too high and its fusion to the base material will be worsened. the chart beside illustrates the
welding
speed
s achieved with different shielding
gas
es with a constant wire feeding
speed
. the lower the co 2 content of the shielding
gas
, the higher the
welding
speed
. 4.3.3. spatter, post-weld finishing unalloyed and low-alloy steels post-weld finishing work forms a significant cost item. if a lot of spatter is generated during
welding
, it must be removed by grinding. the larger the spatter is, the more they contain heat and the better they weld onto the surface of the base material. the higher the carbon dioxide content in the shielding
gas
, the more spatter is formed and the larger the number of large spatter weld- ing onto the surface. spatter originates from the filler material. an increase in the amount of spatter reduces the deposition efficiency and increases the amount of post-weld finishing work required. 100 % 80 % 60 % 40 % 20 % 0 % co2 argon mixture change in total costs: from carbon dioxide to a
gas
mixture. capital a: 60% b: 42% work a: 22% b: 15% filler material a: 7% b: 7% energy, maintenance a: 7% b: 7% shielding
gas
a: 4% b: 8% cost savings a: 0% b: 21% the higher the argon content of the
gas
mixture, the less spatter there is and the less post-weld finishing is required. a b (co 2 ) (argon mixture) mitä argonvaltaisempaa seoskaasu on, sitä vähemmän roiskeita ja jälkityötä. the effect of shielding
gas
in the
welding
speed
. co 2 ar+20% co 2 ar+8% co 2
welding
speed
(cm/min) 55 50 45 40 the effect of shielding
gas
in the
welding
speed
of a horizontal joint meeting a certain a dimension. horizontal weld, a dimension 4 mm, sheet thickness 6 mm, solid wire 1.0 mm, wire feeding
speed
12 m/min.
welding
speed
(cm/min)
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