Ability to weld items by grouping permanently

The title says it pretty clearly. If there was a feature to "weld" two pieces together, so that they could not be un-grouped, and it would make it one piece, that would be extremely useful. For one, it would allow you to make copies of 'parts' that you couldn't accidentally mess up, and for another, it would get rid of seams as found here: http://i.imgur.com/ZYVe5hr.png


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