Re: [MW:26169] GMAW- Spray transfer Lack of Side Wall fusion in FPW welds

Mr. Nair.

Few more details are required to conclude the reason for the said 

defects. Assuming the position is 1G, pl. provide following info.

1. Amps used for 1.2 mm size wire

2. Voltage selected for the amps.

3. Stick out used.

4. Type of shielding gas and flow rate.

If your parameters are Satisfactory, one of the reason for LF could be 

weld travel speed. Pl. check that aspect also.

1.20 mm size wire will produce more out put and it may be difficult to

control the speed of weld on 12 mm thick plate for certain welders and 

it may also lead to LF.

May be proper parameters selection help to avoid the said problems. 

Alternatively, 1.0 mm may help but let us verify the weld parameters first..

Sridhar. 

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From: MW <raghurambathula@gmail.com>
To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Wednesday, 8 March 2017 7:07 PM
Subject: [MW:26169] GMAW- Spray transfer Lack of Side Wall fusion in FPW welds

I have a technical issue with GMAW- Spray transfer process. The wire is 1.2 mm dia. The joint configuration is single bevel butt joint. The weld defect is mostly Lack of Side Wall fusion. The member thickness is 12 mm. All the welds have back chipping and welding. I suggested employing stringer bead technique to improve side wall fusion. But unfortunately, many of the joints are getting rejected in Ut testing. Kindly suggest some techniques/remedy for this problem. Looking forward to your positive feedback. 

Regards, 

Binoj Nair

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