Jasic MIG250P - 7.3. Shielding Gas Selection; 7.4. Welding Process Reference

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OFF
焊枪开关
送 气
输出端子间电压
送 丝
焊接电流
焊接中
慢送丝
滞后送气时间
防粘时间
空载电压
提前送气
收弧
ON ON
OFF
焊接电流
收弧电流
7.3. Shielding gas selection
7.3.1. Metal Active Gas Welding（MAG welding）
It adds a certain amount of oxidizing gas to Argon and usually adopts short circuiting transfer and spray
transfer to conduct downward welding, vertical welding, overhead welding and all-position welding. Besides, it
is mainly applied to carbon steel, low-alloy and high-strength steel and stainless steel.
7.3.2. CO
2
MIG（CO2 welding）
With CO2 as the shielding gas, it usually applies globular transfer and short circuiting transfer to conduct
all position welding. Although it has more spatters compared with other welding modes, this welding mode is
cost-effective which can be widely applicable in common metals.
7.4. WELDING PROCESS REFERENCE
7.4.1. Welding current selection
After preparation, welding current setting can begin. Short circuiting transfer which occurs under thin wire,
low voltage and mini current is suitable to thin wire with diameter less than φ1.6mm. Under this circumstance,
welding is stable with less spatter and nice shape of weld bead. In order to ensure that welding wire matches
welding current, below is reference for current setting. But as for particular materials, please refer to appendix
“welding process table”.
Acceptable current and optimum current during short circuiting transfer welding
Welding wire diameter φ(mm)
Acceptable current（A）
Optimum current（A）
Welding current
Wire feeding
Gas supply
Torch trigger
During welding
Stopping
arc
Crater current
Welding current
Slow wire feeding
Post-flow time
Pre-flow
No-load voltage
Anti-stick time
Voltage between output terminals