I just asked my son. He welds all the new NY. PA. and NJ. turnpike trucks together every day. He said different applications are different. Pushing the wire into the weld is a stronger weld because it give more penetration and heat. The optimal way for a standard weld is straight on. Drag the weld you lay it on top No penetration., Set the welder on pulse. It will drop dime puddles and give you the waves on its own.
Walk the Dog don't drag him.