HOW TO avoid undercut 2G root pass 6010

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Hi folks !This is a sch80 2G 6010 (grey stick) root pass, 70-75 ampsI shoot ton of pixoutside, inside , trough the keyholeWhile welding , seems to me I do an undercut on the topI tried different angle , different speed,drogin' whippin'and still... looks like I do have some undercut.Unless it is NOT an undercut, is it ?For this set of pix I put 8 sticksAny suggestion?Thank you !This is my start up, too hot? that keyhole looks    l a r g ehttp://i239.photobucket.com/albums/f...808_resize.jpgsame stick inside the coupon , first string was too hot, so loooks    u g l y http://i239.photobucket.com/albums/f...815_resize.jpgand another ton of pix, in and out of the coupons  and trough the keyhole,http://s239.photobucket.com/user/wro...tml?sort=2&o=2from the stick #2 up to the stick #8 and final tie in.this is my set up for the machine http://i239.photobucket.com/albums/f...879_resize.jpgThank you for your time and suggestions
Reply:Just going by proportion to gap but it seems you have a very thin land.  Maybe just the pics.
Reply:I'm interested in this too.  Gap filling is a challenge  I encounter often enough, like when I screw up and blow through, or  when drilling and filling holes to join two larger pieces.Hey~!! It's a hobby. It's not supposed to make sense~!!
Reply:Well... from the looks of it... go with a 1/8 land and gap... turn your heat to about 85 for a 1/8 6010... Now with your whip... go with an upwards motion almost a lazy L/saw tooth weave that would allow the top of the pipe to get penetrated a little more to avoid the undercut the upward motion to the unwelded section and then return to the keyhole to fill... and make sure you have an even push motion going in at 90 degrees...
Reply:Looking at your pic...... It doesn't look like you have enough root face on your joint preparation....ensure you have a 2mm root face..... Remember preparation is keySent from my iPad using TapatalkUsing Tapatalk