reason for burnthrough defect

[shankark]

we got BT defect in smaw process welding using E6010 for root, and
E7018 for hotpass, capping. what could be the reason for this defect
and how we can avoid it.

thanks,
shankar

[Arun Das]

Hi Shankar,

Burn-through (too much penetration) is caused by having too much heat input in the weld zone. Please check the current, over current may be one reason for burnthrough.It happen when the speed is very slow so you can increase the travel speed. Burn- through  can  also  result  from  having  an  excessive amount of root opening.

 

regards,

 

 

Arun S Das

 

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From: shankark <shank...@gmail.com>
To: Materials & Welding <material...@googlegroups.com>
Sent: Thu, 30 December, 2010 9:00:24 PM
Subject: [MW:9023] reason for burnthrough defect

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[manoj john]

Dear Sankar,

The following are the main reason for burn through:

1.  Very slow travel speed and high current.

2.   High heat input.

3.   Large root opening.

4.   Uneven root face.

5.   Unskilled welder or welding operator.

Thanks & Regards.

Manoj

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[Pablo J Acelajado]

 

 

Hi!

 

For Burn Through in SMAW, when the material being welded is too thin while using bigger diameter electrode than what is required. For automatic welding, machine malfunctions may cause Burn Through like when machine travel or object being welded stops suddenly while there is continuous welding process. Also, for those requiring tack welds, when there is insufficient weld prior to full welding.

 

Thanks.

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