Mr Duncan Smith, who led the Conservatives for two years during Tony Blair's New Labour government, was at Nova Training in Goscote where unemployed young people are taught skills to help them secure work.
He was supporting Douglas Hansen-Luke, who is standing for the Tories in Walsall North, where Labour is defending a majority of 990 votes.
Centre manager Charlotte Fox told the minister the centre had helped 1,500 young people in the last year.
A group of around 20 learners at the centre put questions to Mr Duncan Smith on issues ranging from support for young parents to what he was doing to encourage businesses to offer apprenticeships.
He told them being long-term unemployed was 'no life' and getting a job would open up their lives to opportunities.
Looking ahead to after the election, Mr Duncan Smith said he had no intention of scaling back the 'bedroom tax' if the Tories win. The Conservatives call it the spare room subsidy. It removes 14 or 25 per cent of housing benefit from council or social housing tenants with one or more 'spare' rooms.
It has been heavily criticised by Labour who claim it hits disabled people hardest.
Mr Duncan Smith added: "Under the coalition government we have seen overcrowding fall for the first time. It is a terrible situation to live in overcrowded accommodation and it needs someone to speak for them.
"I don't know of Labour or anyone else who appears to be concerned about the level of overcrowding. I am concerned.
"The policy has also encouraged people to get into work. That is because often they make the decision they want to be able to pay the extra amount and stay put."
WATCH: Iain Duncan Smith visits @novatraining in #Walsall http://www.expressandstar.com/election/2015/04/24/welfare-reform-has-improved-lives-claims-iain-duncan-smith/ …