Specification for approval testing of welders when welding procedure approval is not required.  Part 1.  Fusion welding of steel / 
British Standards Institution 
 - 16 leaves :  illustrations ;   31 cm. 
 - British standard ;  BS 4872 : Part 1 : 1982 .
 - British standard ;  BS 4872 : Part 1 : 1982 .
<br/><br/><label>ISBN: </label>0580130371