Dime stacks are created from TIG welding, in order to create a similar weld in MIG you need to move the stinger. Circular motion tying in both pcs of material with the weld. You will not get the same effect as TIG but can imitate the look. But you do need to oscillate the stinger to make sure the weld puddle connects Both pcs being welded. Don't just push through the middle.