From Akron, Ohio, Goodyear Tire and Rubber Company workers began returning to work immediately after the union overwhelmingly approved a six-year contract with North America’s largest tire maker. Rank-and-file members of the United Steelworkers of America endorsed the agreement by a four-to-one margin yesterday at 10:30 last night, ending a seven-state walkout by 12,000 workers over job security and pay.