A K Lakshminarayanan
,
V Balasubramanian
钢铁研究学报(英文版)
The microstructure analysis and mechanical properties evaluation of laser beam welded AISI 409M ferritic stainless steel joints are investigated. Single pass autogeneous welds free of volumetric defects were produced at a welding speed of 3000 mm/min. The joints were subjected to optical microscope, scanning electron fractographe, microhardness, transverse and longitudinal tensile, bend and charpy impact toughness testing. The coarse ferrite grains in the base metal were changed into dendritic grains as a result of rapid solidification of laser beam welds. Tensile testing indicates overmatching of the weld metal is relative to the base metal. The joints also exhibited acceptable impact toughness and bend strength properties.
关键词:
laser beam welding
,
ferritic stainless steel
,
tensile property
,
impact property
V Balasubramanian
,
A K Lakshminarayanan
,
R Varahamoorthy
,
S Babu
钢铁研究学报(英文版)
The application of response surface methodology was highlighted to predict and optimize the percentage of dilution of ironbased hardfaced surface produced by the PTA (plasma transferred arc welding) process. The experiments were conducted based on fivefactor fivelevel central composite rotatable design with full replication technique and a mathematical model was developed using response surface methodology. Furthermore, the response surface methodology was also used to optimize the process parameters that yielded the lowest percentage of dilution.
关键词:
plasma transferred arc hardfacing;dilution;response surface methodology
A K Lakshminarayanan
,
K Shanmugam
,
V Balasubramanian
钢铁研究学报(英文版)
The effect of autogeneous arc welding processes on tensile and impact properties of ferritic stainless steel conformed to AISI 409M grade is studied. Rolled plates of 4 mm thickness have been used as the base material for preparing single pass butt welded joints. Tensile and impact properties, microhardness, microstructure, and fracture surface morphology of continuous current gas tungsten arc welding (CCGTAW), pulsed current gas tungsten arc welding (PCGTAW), and plasma arc welding (PAW) joints are evaluated and the results are compared. It is found that the PAW joints of ferritic stainless steel show superior tensile and impact properties when compared with CCGTAW and PCGTAW joints, and this is mainly due to lower heat input, finer fusion zone grain diameter, and higher fusion zone hardness.
关键词:
ferritic stainless steel;plasma arc welding;continuous current gas tungsten arc
