Sec II-C has nothing to do with practical application. It is standardized testing program so that filler metals can be compared on an apples to apples basis.
CO2 used for GMAW (MAG) will result in a short circuiting arc transfer mode
A mix of 90%Argon – 10% CO2 will mostly like result in a spray transfer
Choice of transfer mode (shielding gas, amperage, voltage) is usually based on thickness of material to be welded.
John A. Henning
Welding & Materials
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of prem nautiyal
Sent: Monday, December 19, 2011 11:47 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:13233] Tandem MIG welding
For ER 70S-6, the shielding gas as per ASME Sec II-C , SFA 5.18 is 100% CO2. Why are you using a mixture ?? Please change your shielding gas to Co2 first and then give feedback.
From: S C Balawat <scb12345@gmail.com>
Subject: [MW:13227] Tandem MIG welding
To: "materials welding" <materials-welding@googlegroups.com>
Date: Sunday, December 18, 2011, 8:23 AM
Good morning group members ,
I would like to know your experience in Mig welding with TBi TD 20 Tandem torch of TBI industries . We are experiencing problems like burn through, excessive spatters, undercut in the welds. Weld is fillet of 10 mm. We simultaneously weld two fillets using robots. Job rotates in vertical plane and the robots are stationary . We are unable to stabilize the weld quality . Thickness of the at the joint is 10 mm and 14 mm in one weld joint and in another it is 10 mm and 12 mm.Welding gas is 90/10 argon / CO2.Power source is "power wave robotic 655 " of Lincoln Electric
We are using 1.6 mm solid wire in the leading torch and 1.2 mm in the following torch . Weld parameters are 400amps/28 volts and 360amps /27 volts respectively.weld wire is ER70S-6 in Marathon spools. Weld wire is ESSAB make .Material of the joint members is AISI 1020.
I look forward to your comments /suggestions.
Regards,
S C Balawat
Sent from my iPad
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