Fillet size a6 with single layer (GMAW welding process)

[Vijay Katkar]

Dear Experts,

Our customer is forcing us to do multilayer welding for 6mm throat size, which is increasing our welding time because most of welding is in a6 size.

I have tried so many test coupon to prove that a6 can be done by single layer but I am not succeed in all test.

Customer requirement is root penetration at least 0.3 mm. But I am not able to achieve it. refer following parameters which I have used.

• Welding process :- GMAW
• Filler Wire :- ER 70 S6 (1.2 mm dia)
• Shielding gas :- 80 % Argon + 20 % Co2
• Current :- 245-255 Amp
• Voltage :- 26.5 to 27.5
• Travel speed :- 220 - 240 mm/min

Please advise any modification is required in the parameters.  

Should I change Shielding gas composition?

Waiting for your valuable reply?

Thank you

Vijay Katkar

[Prasad Rode]

Dear,

6mm throat fillet with single layer will leads to more weaving.
As a general thumb rule, weaving should not be more than 3 times of electrode dia.
Weaving leads to increase chances of crack and decrease the toughness in welding. Means leads to weak welding.

In short, for 6 mm fillet weld, u have to do first root weld and then multi weld over it.

Multi layer welding,gives strength to weld. It is always be good.

Regards
Prasad

[Kannayeram Gnanapandithan]

For GMAW, no code/std restricts on weaving width

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[Prasad Rode]

Dear,

Weaving should always be avoid. It doesn't mean, it is given in code or not.



Regards
Prasad

[Vijay Katkar]

Dear Expert,

My concern is regarding root penetration.

Is it not possible to make a6 size fillet weld with single layer?

Thank you

Vijay Katkar

Regards
Prasad

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[Kannayeram Gnanapandithan]

Use 1.6mm, amp around 355

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[pgoswami]

Hello Vijay,

 

To answer to your query in a straight forward language:-

• Depositing a fillet weld of 6 mm throat by GMAW process in a single pass is difficult. 6mm of throat = 9 mm of leg length, which is difficult to cover in one pass, unless the welder does edge to edge weaving.
• Extended weaving would cause  loss of  travel speed and  production time.
• Also it would induce undue defects e.g. toe undercuts. If so, one has to spend more time on grinding and subsequent dress ups, a redundant exercise.
• Also if the materials have notch toughness or corrosion resistance requirements ( for austenitic or other stainless steels) , it may be compromised by a single pass technique.
• Hence the so called gain of production time would mean nothing.

 

The parameters suggested by you are fine, if you perform a multi pass techniques. Or else you may try the welding parameters suggested by Mr Kannayeram Gnanapandithan, however the welder has to be comfortable. If the fillet weld involves any more welding positions other that 1F, 1.2 mm dia filler is more flexible to weld with.

 

Thanks.

 

 

 

Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist.
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

pgos...@quickclic.net

pradip....@gmail.com

 

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[c sridhar]

     Mr. Vijay

      

      As pointed out by you,  a 6, throat can be welded using single pass technique.

     The leg length  will work out to be 8.50 mm or 9.00 mm  . You easily get it using

     following parameters. 

     Have carried out hundreds of joints in 2F position.It can be achieved with few

     trails at your end and without any undercuts.

     You can also succeed with 

• Welding process :- GMAW.

• Filler Wire :- ER 70 S6 (1.2 mm dia)

• Shielding gas :- 80 % Argon + 20 % CO2
• Wire feed 10.30  m/min. on Lincoln  or 9.90 m/min on Miller or it may vary                 depending up on machine and its condition.
• Current : 280 - 290  Amps
• Voltage : 28.5 to 29.
• Travel speed : 270 - 300 mm/min
• Position 2F

    If you need any further info. pl. let us know.

    Sridhar. 

    sridh...@yahoo.com

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From: Kannayeram Gnanapandithan <kgpan...@gmail.com>
To: materials-welding <material...@googlegroups.com>
Sent: Friday, 20 January 2017 7:53 PM

Subject: Re: [MW:25956] Fillet size a6 with single layer (GMAW welding process)

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[Vijay Katkar]

Ok,

Sure I will try the on given parameters and I will update you all with macro graph.

Thanks for your support.

Vijay Katkar.

On 20 Jan 2017 9:33 p.m., "pgoswami" <pgos...@quickclic.net> wrote:

Hello Vijay,

 

To answer to your query in a straight forward language:-

• Depositing a fillet weld of 6 mm throat by GMAW process in a single pass is difficult. 6mm of throat = 9 mm of leg length, which is difficult to cover in one pass, unless the welder does edge to edge weaving.
• Extended weaving would cause  loss of  travel speed and  production time.
• Also it would induce undue defects e.g. toe undercuts. If so, one has to spend more time on grinding and subsequent dress ups, a redundant exercise.
• Also if the materials have notch toughness or corrosion resistance requirements ( for austenitic or other stainless steels) , it may be compromised by a single pass technique.
• Hence the so called gain of production time would mean nothing.

 

The parameters suggested by you are fine, if you perform a multi pass techniques. Or else you may try the welding parameters suggested by Mr Kannayeram Gnanapandithan, however the welder has to be comfortable. If the fillet weld involves any more welding positions other that 1F, 1.2 mm dia filler is more flexible to weld with.

 

Thanks.

 

 

 

Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist.
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

pgos...@quickclic.net

pradip....@gmail.com

 

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAJzm4eNnuo8h7GBukApQOm-porkj8PRk%2BMeJYg6sSrALXSqSaA%40mail.gmail.com.
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