[MW:3617] Fwd: Re: [MW:3609] E316 SS plate - porosity issues

>>> <ruscitto@tutopia.com> 07/11/2009 07:40:19 pm >>>

----- Original Message -----
From:
To: materials-welding@googlegroups.com
Sent: Sab Nov 7 16:23
Subject: Fwd: Re: [MW:3609] E316 SS plate - porosity issues

Hi:

May be there are some reason like:

1°) Dirty base metal (Clean joint faces and adjacent surfaces)

2°) Dirty filler electrode (Use specially cleaned and packaged electrode, and store it clean area)

3°) High solidification rate (Use preheat or increase heat imput)

 

4°) Inaproper arc length, welding current, or electrode manipulation (Change welding conditions and techniques)

 

 

 About the redry electrode, follow the recomendation from supplier

 Regards

Antonio Ruscitto

 

On Sab Nov 7 13:55 , mahen dran sent:

 

Hi,

 

I am mahendra from KSA.

 

using 316L oerilicon electrode over 316L plate ((Flange joints - thickness around 8 mm)),

which creates porosity issue sometimes here . WPS and PQR are followed properly and there are no significant variation.

The electrode supplier suggests to use it in rebake oven.

 

We knows low hyd. electrodes  which  are ending  with 5,6 and 8 are to be used  with oven.

Is it correct way or normal proceudeure to use the SS electrode in oven ?

What is the control parameter to eliminate the porosity issue after  welding (Especially in  SS plate)

 

mahendra.t

 

 

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