In an unusual move, the chairmen of the House Ways and Means, Education and Labor and Agriculture committees agreed yesterday on a procedure to expedite House action on President Carter's welfare proposal. Carter will announce his plan today at home in Plains, Ga.

Delegates from the three committees will meet jointly for hearings and initial recommendations early this fall, then will refer the welfare reorganization plant back to the parent committees for additional work.

"It seemed best to get a coordinated approach on this wide-ranging program that cuts across a number of committee jurisdictions," said Agriculture Committee Chairman Thomas S. Foley (D-Wash.).

Joseph A. Califano Jr., Secretary of Health, Education and Welfare, worked with the three chairmen and House Speaker Thomas P. O'Neill (D-Mass.) throughout the week on the agreement.

"The President and I are grateful for the cooperation that agreement represents. We look forward to working with the House as it begins the complicated tasks of restructuring our fragmented welfare system," said Califano.

The combined three-way committee study is expected to save many months of negotiating. Committe chairman anticipate that the proposal would reach the House floor in late spring, 1978.

Carter arrived home in Plains, Ga., last evening to begin a five-day vacation.

En route, White House officials released a directive from the President ordering the Council on Wage and Price Stability to undertake a study of prices, cost and overall economic conditions in the steel industry. Details on C8 .

Last night, Carter attended the wedding of his brother-in-law, Murray Smith, to Helen Donnan at the United Methodist Church in Plains.

At this morning's welfare press conference, the President will be joined by Califano and Labor Secretary Ray Marshall, who spent last night in nearby Albany, Ga.