Hi, it might be cause of moisture on basemetal.Have you done preheating.
Surrounding area of 75mm each side of the weld joint/ Back gouged area shall be preheated to full thickness as per WPS to remove moisture to avoid porosity (Preheating temperature should be 75C min-120C max) and not longer than 30 minutes. (Excessive time and temp. shall affect the properties). Also please find herewith the attached file might be useful to you.
Thanks & Regards,
(Karthik)
Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282
--- On Wed, 11/3/10, Kisan Gamane <kisankrishna1506@gmail.com> wrote:
From: Kisan Gamane <kisankrishna1506@gmail.com>
Subject: [MW:8029] porosity in aluminium welding.
To: materials-welding@googlegroups.com
Date: Wednesday, November 3, 2010, 1:40 PM
Any body can suggest to avoiding porosity in aluminium welding. material is 5083 aluminium alloy. i have used pure argon gas as shielding gas in GTAW process.
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अन असाच राखेत विरणार नाही...
ठसे सोडूनी जाईन जीवन काठावरती
आल्या लाटा कितीही , मिटणार नाही ...
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