The 23-year-old has signed a long-term deal with the north London club after completing a £16m switch to the Gunners from Manchester United on Monday.
Welbeck, who scored nine goals in 25 Premier League games last season, was facing an increasingly difficult battle for a first-team spot after Radamel Falcao’s arrival at Old Trafford.
The new Gunners signing is currently on international duty with his new Arsenal team-mate Wilshere, and the Gunners midfielder welcomed the striker to The Emirates.
“Big welcome to my boy Welbz….great player for a great club! Another English lad! #Gooner,” Wilshere posted on Instagram.
Earlier on Monday, Arsenal captain Mikel Arteta claimed that Welbeck would suit the Gunenrs’s style of player after his big-money move.
— Mikel Arteta (@m8arteta) September 2, 2014
Welbeck is Arsenal’s fifth signing of the summer after Arsene Wenger landed £35m man Alexis Sanchez, full-back Mathieu Debuchy, goalkeeper David Ospina and teenager Calum Chambers.
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news