The 32-year-old defenseman, who can become an unrestricted free agent after next season, had 16 points (two goals, 14 assists) in 78 games with the Sharks this season and one assist in 20 Stanley Cup Playoff games.
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Braun said he is looking forward to joining the Flyers after the initial shock of being traded by San Jose, where he played the first nine seasons of his NHL career.
"Little surprised," he said. "[I've] been with the Sharks for a long time ... but at the same time it's exciting, something new, something different. This is a fun team, playing them, watching them over the years. It'll be exciting to jump into that group."
Flyers general manager Chuck Fletcher expects Braun to add a veteran presence.
"We are excited to add Justin to our group of defensemen," he said. "He is a high-character, quality defender who will bring a steadying presence to our team."
A seventh-round pick (No. 201) by San Jose in the 2007 NHL Draft, Braun has 154 points (24 goals, 130 assists) in 607 NHL games, all with the Sharks, and 13 points (three goals, 10 assists) in 84 playoff games.
Braun said he is impressed by Philadelphia's defense corps, particularly Shayne Gostisbehere and Ivan Provorov,
"Those are the two I probably know the most, played against them the last few years," Braun said. "They're dynamic, they create a lot, they jump in the play a lot. You've got to have those guys out there pushing the pace because you're not going to get much offense if you're taking 3-on-3 rushes. You've got to get that fourth guy in the rush. Hopefully I can help those guys, but those guys seem to be great at it. Hopefully I can keep up going forward.
"[Fletcher] said, 'I don't want you to be a mentor, I want you to be a player,' so that's important. I'm there to play, not just take care of guys. Whatever I can teach them ... how to be a good pro, what you need to do day in and day out, hopefully I can show them a little bit of that. They've also got good leadership there, they've got [forward Claude] Giroux, he's been there forever, one of the best in the game. I'm sure they've got some good guys around. Anything I can help them try to do."
San Jose GM Doug Wilson praised Braun's contributions during his time with the Sharks.
"Justin has been an important part of our organization since we drafted him in 2007, and over that time we have seen him develop not only as a player on the ice but as a man," Wilson said. "He has played a large role in our team's success since joining the Sharks roster, including appearing in three conference finals and competing for the Stanley Cup in 2016."
Braun is the second defenseman acquired by the Flyers in the past five days; Philadelphia obtained Matt Niskanen in a trade with the Washington Capitals for defenseman Radko Gudas on Friday.
"I saw the Niskanen trade," Braun said. "I know him, we have the same agent (Neil Sheehy). I know [forward James van Riemsdyk] pretty well from him being out in Minnesota in the summers; he sent me a text. It's nice to know a couple guys as you try to get your feet under you. Talked a little bit about the goaltending and everything; you watch Carter Hart and he looks like the real deal. It'll be exciting to play in front of him. Good step moving forward."
NHL.com deputy managing editor Adam Kimelman contributed to this report
