The Bruins started their two-game road trip on Saturday at Wells Fargo Center with a good laugh. The Bruins routed the Flyers, 6-1. They sent starting goalie Steve Mason to an early exit after grabbing a 4-0 lead. The Bruins added two power-play goals in the third (Jarome Iginla, Zdeno Chara) to complete the blowout. Claude Giroux scored Philadelphia’s only goal on a power play in the third. The Bruins, up, 2-0, after 20 minutes, popped in two more in the second. They took a 3-0 lead after Reilly Smith blew through the defense and put a shot on goal. The puck glanced off the right post, off Mason’s backside, and over the line at 6:59. The second line struck again, this time chasing the starter. Mason booted the rebound of Brad Marchand’s sharp-angle shot to the stick of Patrice Bergeron, who buried his present at 13:10. Coach Craig Berube replaced Mason with Ray Emery after the fourth goal. There were two fights in the second. Scott Hartnell tangled with Johnny Boychuk. Luke Schenn got the better of Gregory Campbell after Bergeron’s goal. The Bruins grabbed a 2-0 lead in the first period with little effort. The Bruins got a gift on their first goal, which took place on the power play. Giroux was in the penalty box, serving a tripping penalty. Chara flung a shot on goal from the right side of the goal line. Chara’s shot thudded off Braydon Coburn’s left skate and hopped over Mason’s glove at 6:30. The Bruins doubled their lead in the final minute of the first. After some good wall work by Milan Lucic, Iginla got the puck at the right circle. Iginla let a long-distance wrister loose that sailed through a Nicklas Grossman screen and past Mason with 17.1 seconds remaining in the period.