problem align weldments

hi guy ... iam new in the forum

i have stupid problem .. iam making a estrutural weldments for a bus and i have some problems with align weldments ..

i made a exemple iam gona post it image and file sldprt .. i need to align in start and the end of each weldment

pls help mee

thks

pedro

pls help me ...

SolidworksWeldments