as the pic show,how to design the detail?what need to check about the bolt,the weld,and the gusset plate? THX.

ensure the fastness of bolt that is right for the hole;
ensure both the uniformity and size of weld;
keep the same size of both sides  along the connection part of the gusset plate.
  
of course,it's the first step to design the detail of criterion.

check:
bolt shear:
bearing :
connection material :
whitmore section yield:
gusset buckling:
weld: