1. Duplicate the secondary (teil) pipes and inflate them slightly (push modifier) 2. Make main pipe a compact object via ProBoolean, then add the inflated pipes to the main one with move+union+imprint options. Make sure there's some space between where they intersect. 3. Convert main mesh back to an editable poly, or use an edit_poly modifier, and Inset the newly created tube outlines on the main mesh until the sides line up with your non-inflated pipes. 4. Clean up the outer part of the inset holes 5. delete the inner holes, and weld your pipes as needed.
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2. Make main pipe a compact object via ProBoolean, then add the inflated pipes to the main one with move+union+imprint options. Make sure there's some space between where they intersect.
3. Convert main mesh back to an editable poly, or use an edit_poly modifier, and Inset the newly created tube outlines on the main mesh until the sides line up with your non-inflated pipes.
4. Clean up the outer part of the inset holes
5. delete the inner holes, and weld your pipes as needed.