Hi Mr. shukla,
In HR fraternity it is generally observed that HR , IR is used as separate term but in my opinion HR is a holistic term where IR can be part of it. Basically, HR deals with relations , performance, engagement,employee satisfaction, transformations, HR strategies, talent management, L&D , OD so on...IR refers to harmonious industrial relations with respect to employee and employer which is core area of HR.
IR is generally referred to unionized environment of working dealing with trade union act, ID act and standing orders other areas related, in and around these statues apart from other labour statues.
Expectation from IR manager is to maintain balanced relation with unions, their grievances, welfare measures, long term settlement, strikes, lock outs, layoffs and disciplinary procedures so on ...
Regards
LGR