If your shroud clogs enough to bridge between shroud and contact tip you're gonna fuse the shroud to the job and damage the torch, plus drag the shroud through moulten weld? MB25 torches aren't particularly big or heavy duty.
Each to their own but it's not an advisable method of welding.
No you're pushing along. The torch in the pic above is only a clarke stylee torch. MB250s aren't that small. 20mm ish OD on the shroud. This is in an industrial environment, We don't let them get to that state they block up like that.
ah right now im finding things contradictory.
Looking at this guide in particular the video the author is pulling not pushing. http://www.mig-welding.co.uk/butt-weld.htm
I am about to weld up some sills on my car once I finally decide on the MIG to buy,
Rob, it can be a bit confusing at first, but the basics are that you push the torch when you are using mig with gas, as Snooper and others point out. However there will be odd occasions when you may not be able to push, due to space or other restrictions, so you have to drag for a short distance anyway. But most mig with gas tends to be pushing.
When you are using gasless flux-core mig wire, you will be mainly pulling or dragging the torch, just as you would be if it was a stick (arc) welding rod. There may be odd occasions using gasless when you are unable to drag the torch, again due to work space restrictions, and you have to push weld for short bursts, but generally when using gasless mig wire it is mostly dragging.
Using gasless flux-core wire creates more heat, just as stick (arc) welding does, so you are moving away from it to minimise heat build-up in the work-piece.
If you think you may be working outside quite a bit, or anyplace it might be difficult to drag cylinders to, consider buying a mig that is capable of both gas and gasless welding. That way you cover more possibilities for the jobs you can do, and where you can do them.
Gasless wire is more difficult to use on thin metal though, and although I have repaired sills and even wings with it, I wouldn't advise it for someone starting out, unless you are prepared to give it a great deal of practice.