Two of the Northwest's largest shipyards are merging, creating a combined entity that will generate $650 million in revenue this year. Portland-based Vigor Industrial LLC is acquiring Seattle-based Kvichak Marine Industries, in an exchange of stock and cash. Vigor CEO Frank Foti declined to disclose the particulars of the transaction between the two privately held companies. The combination of Kvichak revenue and organic growth will add about $100 million to the new company's bottom line over the…