Conventional CO2 gas shielded arc welding
(a)A metal droplet is blown off at the moment of
(b)
(a)
arc re-ignition just after it short-circuits.
(b)A large metal droplet detaches being repelled
upwards by the arc force, and it scatters with
Droplet is repelled
Arc re-ignition
rotation.
By optimizing the pulse current for
each timing of droplet formation and
detachment, the metal droplet can be
controlled to transfer regularly with a
Droplet is produced
constant size in globular mode.
Shielding gas
100%CO2
Upper part is squeezed
Shielding gas
80%Ar-20%CO2
Droplet is detached
Shielding gas
100%CO2
Conventional
CO2
Conventional CO2
Pulsed MAG
Feature 1 Lower spatter and fume, Low cost
Conventional CO2
Pulsed MAG
7.0
3.0 282A
340A
2.4
≦0.5mm
0.5∼1.0mm
>1.0mm
1.8
1.2
0.6
250A 302A
234A 287A
0
100
130
100
130
100
130
Wire melting rate (g/min)
Comparison of spatter generation rates in
flat fillet welding
Fume emission rate (mg/g)
3.6
Spatter generation rate (g/min)
Low Spatter, Fume and High Efficiency CO2 Gas Shielded Arc Welding
Low Spatter, Fume and High Efficiency
CO2 Gas Shielded Arc Welding
6.0
Conventional CO2
5.0
4.0
3.0
2.0
Pulsed MAG
1.0
29.0
31.0
33.0
35.0
37.0
39.0
Arc voltage (V)
Comparison of fume emission rates
（Welding current 280-290A）
Feature 2 Higher efficiency and Saving energy
Feature 3 Deep penetration
Wire melting rate (g/min)
170
150
130
110
Pulsed MAG
90
Conventional CO2
70
50
150
200
250
300
350
Pulsed MAG
290A
400
Comparison of wire melting rate（Welding speed : 30cm/min, Tip height : 25mm）
At the same mean current, wire melting rate in
is higher by approximately 20-25%
Leg lenght (a+b)/2 (mm)
12
11
10
Pulsed MAG
9
8
Penetration depth (a+b)/2 (mm)
Welding current (A)
2.8
2.4
a
b
2.0
1.6
Pulsed MAG
1.2
0.8
7
8
7
a
6
150
200
250
300
9
10
11
12
Leg length (mm)
b
350
270A
400
Comparison of penetration depth（Welding speed : 30cm/min, Tip height : 25mm）
In
, the weld penetration profile exhibits a bowl-shape form with broad and
deep penetration, which is more resistant to weld defects.
Welding current (A)
Comparison of leg length
（Welding speed : 30cm/min, Tip height : 25mm）
Efficiency of
Specifications of
Robot
Conventional CO2 process
Good looking bead appearance
Low spatter
Low fume
Increase the
deposition rate
Decrease the cleaning time
and the cost required to
remove spatters
Improve the work environments
Increase the leg length
Ar-rich-gas-mixture GMA
Power source
AB500
Shielding gas
100%CO2
Wire
MG-50REG (1.1mmφ)
Welding current
∼330A
Wire feeding speed
∼2000mm/min
Welding speed
∼400mm/min
Tip height
25mm
Welding position
Flat・Horizontal
Decrease the gas cost
Ar-rich-gas
⇒ CO2 gas
Deep penetration
Decrease the risk of
weld defects as blowholes
WELDING BUSINESS
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