[MW:6329] RE: 6323] Porosity in Aluminium welding Reg.,

Turbulence of weld pool - Increase welding current to stabilize transfer of metal droplets.

Wet or contaminated shielding gas or inadequate flow. - check dew point of gas (max -57 °C), Increase flow rate

Fast cooling rate of weld pool - Use higher welding current and/or a slower travel speed, preheat base metal (150 °F max or refer to AWS D1.2)

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Warke, Robert
Sent: Friday, August 06, 2010 9:07 AM
To: materials-welding@googlegroups.com
Subject: [MW:6327] RE: 6323] Porosity in Aluminium welding Reg.,

Dissolved hydrogen in the base metal is one common reason for porosity in aluminum welds.

 

~RWW

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of kcrtechnical
Sent: Thursday, August 05, 2010 10:39 PM
To: materials-welding@googlegroups.com
Subject: [MW:6323] Porosity in Aluminium welding Reg.,

 

Dear All,

 

What are all the probable reasons for getting porosity in aluminium welding, other than weather conditions,   here both material and filler are 99.7% Pure Aluminium.

 

Please share with any type of reason.

 

K C R