Few years back even I used to get the similar wormholes in my FCAW Welds (can't disclose the brand).
I tried many variables.
Eventually the only variable that helped was change of brand !!
Also your travel speed of 800mm/min is very high.
Aim for @ 300 to 350 mm/min
Regards
Prem Nautiyal
9769316004
Sent from my Samsung Galaxy smartphone.
-------- Original message --------
From: Kannayeram Gnanapandithan <kgpandithan@gmail.com>
Date: 06/08/2016 19:13 (GMT+05:30)
To: materials-welding <materials-welding@googlegroups.com>
Subject: [MW:25208] Worm track/hole
Process FCAW, Wire E81T1-B2/Dia 1.2mm, shielding 85%Ar+15%Co2. Flow rate 20lpm. Current 240amps, 26 volt, travel speed 800mm/ minute. while welding, we are getting defect of wormholes/wormstracks , some time continuous and intermittent on top of the weld. Experts, what would be the reason for this defect?
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
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