Transverse crack observed after fillet welding

[kishore barbudhe]

Dear expert,

We observed transverse cracks after completion of fillet welding.

We are using EA2 filler wire in submerge arc welding and parent materials is E 450.

Please give us advice to resolve this issue.

Thanks & Regards

Kishore B 

[Vishwas Keskar]

Which flux/ wire brand  is used?

What is Fillet size?

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[Prakash Hegde]

Hi

There is a tendency of Cracks in Fillet weld 

if

Set up is not proper I. e  uneven at matching /mating  surface causing distortion

There should be strong tack weld on both ends and on opposite sides

Improper st up causes heavy stresses on weld causes cracks

 Regards

Hegde

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[kishore barbudhe]

Hi, 

during fit up 100 mm tackweld done on both side joints. i observed that after 1st pass i was check LPT after 24 hrs & found there is no crack. but, after 3rd pass of welding observed transver cracks overall 12 meter length

Regards

Kishore B 

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[Ahmed Osman]

Dears ,

Mo. in EA2 wire have a tendency for hardness increasing after reheating especially with active flux ,

u can try to use neutral flux or use Mn Si wire

Best Regards ,

ENG. Ahmed Osman

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[james gerald]

It seems to be like Hydrogen cracking.

1. Check whether your SAW Flux Baked properly in recommendation with Manufacturer.

2. Clean the weld surface free of oil, Grease, Paint etc..

3. Check the ratio of mixing old flux recovered after welding with new Flux.

Thanks & Regards

J.Gerald Jayakumar

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[Prakash Hegde]

Thkness of tack weldshould be thicker 

And no gap in fit up

Preheat is prefered

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On Mon, 16 May 2022 at 12:03, 'kishore barbudhe' via Materials & Welding

<material...@googlegroups.com> wrote:

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[james gerald]

Hydrogen cracking is because of below.

1. Presence of Hydrogen. (By proper Baking of Flux for SAW and a clean environment can be reduced).

2. Susceptible Microstructure like Martensite (which can be prevented by Preheating and Heat Input)

3. Stresses (May be Internal or External, by proper alignment using Tacks and reducing the cooling rate it can be avoided).

Thanks & Regards

J.Gerald Jayakumar

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[pgos...@rogers.com]

Hi Kishore,

 

What’s the width of the fillet weld at the 3^rd pass?

Is you welder trying to deposit a single pass fillet weld for the capping pass or following a multi-pass weld to finish the capping run.

What’s the voltage involved?

If the width is typically > 4 x Core Wire Diameter , with higher voltage say > 35V , centerline cracking in SAW welds may occur.

 

Thanks.

 

Pradip Goswami.P.Eng, IWE.

Independent Welding & Metallurgical Engineering Specialist

Email:pgos...@rogers.com,pradip....@gmail.com

Cell/Whasapp:1-905-9793232

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