[bruce991]

What I would try (experiment?) is to make some sort of argon dam under the V and apply some purging to it (maybe heavy aluminum foil if the heat can be controlled). Also, the argon cfh should be reduced about 25% on corner and edge welds (probably heard that on a Weldmonger video).

Will do on next one, I do have aluminum foil out in the shop. Hadn't thought of reducing CFH 25%. I don't have a dual regulator unfortunately, so purge is not possible, but daming backside is a good idea.

Another thing I just thought of. I had used red dykem layout dye and was not able to get all of it off the metal. So that is probably contributing to contamination.

[weldin mike 27]

The idea mentioned above is on the money. One must remember that argon gas is very heavy, and flows like water. It will fall away like nobodys business.

Mick

[HitMissTom]

To add to the dam idea; I would make some sort of below dam then put the weld on a slope with the argon entering at the low point and exiting on the high side through a smaller vent hole. Glad you brought out about argon being heavier that air. If it were just level the argon would most likely flow like a river out the far end. Even without argon purge perhaps the dam may help some by capturing some torch argon??