1. Narrow-gap welding a process for all position welding;Butler;Welding J.,1969
2. Application of narrow gap welding process;Sawada;Welding J.,1979
3. Advantages and successful use of TIG narrow gap welding;Löhberg,1986
4. Distortion of thick cylinder welds by narrow groove MIG welding;Ohsawa,1983
5. Computations of residual stresses due to multi-pass welds in piping systems;Rybicki;ASME J. Pressure Vessel Technol.,1979