welding

[andyuk697]

hey everybody ive been bust again today the main chassis is complete i am now starting the transmission tunnel rear suspension frame work,

before i start i was wondering, where d3 and d1 meet u3 and br3 and br1 for example do i need to fully weld br3 br1 u3 then put d1 and d3 in place or do i tack weld as i go then weld where i can get to? the same with the corner of br12 and br5 do i fully weld that then put sb1 on top then weld round the bottom of sb1 or do i tack br12 br5 then put sb1 on top and weld round the bottom

does that make sense?
also when should i start fully welding bits together?

Andy