7.2.4.2 Manual, semi-automatic GMAW using the globular, spray or pulsed mode of metal transfer is acceptable subject to the following: • Not permitted for the root pass of single-sided or doublesided butt welds without backing unless the root pass is completely removed
• Not permitted for the fill and capping passes of set-in or seton type branch connections with nominal diameter less than or equal to NPS4.
• Not permitted for welding piping connections smaller than NPS4