TWI Industrial Member Report Summary 42/1977
By J Honeycombe and T G Gooch
Mechanical properties of welded joints in three stress corrosion resistant stainless steels have been examined. The materials studied contained 26%Cr/5%Ni/1.5%Mo (Steel 1), 18%Cr/5%Ni/2.7%Mo (Steel 2) and 26%Cr/-1%Mo (Steel 3). Butt welds were prepared in plate of 10-13mm thickness using a range of welding processes and consumables. Tensile, Charpy and COD tests were carried out. Simulated heat affected zone (HAZ) samples were also studied.
In all three materials, transverse tensile strength of welded joints were comparable with those of parent materials. The toughness data obtained indicate that welded joints in Steels 1 and 2 show generally good toughness at temperatures of 0ºC to 200ºC as appropriate to probable service application. Considerable flexibility exists regarding choice of process and consumable type. Welded joints in Steel 3 gave variable results, but in a number of cases relatively low HAZ toughness was observed at temperatures of interest. Low parent material toughness parallel to the plate surface was noted.