1. 1) C. PFEIFFER: Welding J., 40 (1961), p.311S
2. 2) S.A. AGNEW, M.D. MITTELMAN, and R.D. STOUT: Welding J., 39 (1960), p.493S
3. 3) W.S. PELLINI, P.P. PUZAK, and E.W. ESHABACHER: Welding J., 38 (1959), p.209S
4. 4) V.H. PAGANO and K. CHESNEY: Welding J., 43 (1964), p.92S
5. 5) C.R. ROPER, Jr., K.A. KOSHINITZKE, and R.D. STOUT: Welding J., 46 (1967), p.254S