The best way of doing that is to run beads. And that can be done with a Tee joint. A simple tee joint allows you to run the bead straight by following the seam while ensuring each bead overlaps the previous one, halfway. SHORT CIRCUIT MIG UPHILL TEE This type of tee needs gun manipulation for penetration and to avoid excessive convexity. In short, if you don’t do something to let the bead lay down flat, it may hump. Well, this is just a characteristic of this type of tee. But then, this happens because of the gravity.