Posted by: novembri yusuf | November 20, 2008

MEMILIH JENIS GAS SHIELDING DALAM WELDING

    Memilih jenis gas yang akan digunakan dalam pengelasan seperti GTAW dan GMAW harus diperhatikan dengan cara seksama dan mengerti manfaat dan tujuan dari pengaruh gas tersebut terhadap proses welding seperti penetration, bead shape, porosity, cost dll.

    Di bawah ini ada sedikit tips yang mungkin bisa dipakai sebagai guide untuk memilih jenis gas yang akan digunakan.

   tabung-gas

Shielding Gas Considerations for Aufhauser Corporation Solid Stainless Steel Cut Lengths and Spooled Wires

GTAW (TIG) – Argon is suggested for thickness up to approximately 1/2″. For thicker sections, argon-helium mixtures or pure helium may be used for deeper penetration. Argon-hydrogen mixtures are occasionally used to improve bead shape and wetability.

 

     gas

GMAW (MIG), Spray Transfer – 99% argon – 1% oxygen is predominantly used. This mixture improves arc stability; produces a more fluid and controllable weld puddle with good bead contour. Undercutting is minimized on heavier sections. 98% argon – 2% oxygen provides better arc stability and welding speed than the 1% oxygen mixture for thinner stainless steel materials.

GMAW (MIG), Short Circulating Transfer – 90% helium + 7.5% argon + 2.5% CO2 has no effect on corrosion resistance; provides small heat-affected zone; no undercutting; and minimum distortion.

300 Series Stainless Steel GMA (MIG) Welding Parameters

Short Circuit Transfer: 
Electrode
Diameter, inches
Welding Current,
Amperage
Arc
Voltage
Wire Feed
Speed, ipm
0.030
0.035
0.045
60 – 125
75 – 160
100 – 200
17 – 22
17 – 22
17 – 22
150 – 430
120 – 400
100 – 240

 

Spray Transfer: 
Electrode
Diameter, inches
Welding Current,
Amperage
Arc
Voltage
Wire Feed
Speed, ipm
0.030
0.035
0.045
1/16
3/32
160 – 225
180 – 300
200 – 450
220 – 500
250 – 600
24 – 28
24 – 29
24 – 30
24 – 32
24 – 32
440 – 650
430 – 500
220 – 400
110 – 210
50 – 80

Responses

  1. belajar detail jenis-jenis welding dan materialnya

  2. Makasih pak infonya mantap, boleh tanya gak bagai mana mencari persamaan AWS pada SMAW ke GMAW misalkan SMAW E7018 apa wire yang cocok dan sama jika menggunakan GMAW.


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