centreline crack

[Gigin Gumilar]

Dear expert,

Any suggestion to prevent centreline crack? i was found centreline crack exist on the first run/layer after backgouging.
base material is S355JR 50mm thick with joint configuration double bevel tee joint full-pen weld by SAW.

Thank you for your help

Rgds,
Gigin

[Chirag Sandhane]

Dear gig in,

Cente line crack come in during welding because of following reasons.

1. Your depth to width ratio is high means narrow groove design.
2. There may be high percent of carbon or sulfur or phosphorus in consumable.

Because melting point of sulphur and phosphorus is low, they solidify after sodification of remaining elements.

Thanks & regards.

[Gopalakrishnan G]

what s ur joint design? if it is double bevel whether 1/2 on both sides or 2/3 & 1/3 ? preheat temperature?

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G.Gopalakrishnan
Welding Engineer
Mukand Ltd
Mumbai
Moble :+91-9833397917

[george....@gr.bureauveritas.com]

did you preheat?
maybe a lot of heat sink and rapid cooling on first pass

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor

I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS PIRAEUS - GREECE

Tel: +30 210 40 63 113 /4 /5
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04


Gopalakrishnan G ---14/06/2015 09:31:10---what s ur joint design? if it is double bevel whether 1/2 on both sides or 2/3 & 1/3 ? preheat tempe

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