Purpose: The influence of metal active gas welding variables, including current, wire
feeding speed and gas flow rate on the ultimate tensile strength and critical buckling load of
steel (St.24) and the optimized welding conditions were discussed.
Design/methodology/approach: The experimental steps are firstly designing the
experiments, secondly conducting the mechanical tests, thirdly analysing the results through
Minitab 16 and finally determining the optimum welding parameters. Confirmation tests of
the optimized variables were validated.
Findings: ANOVA approach manifested that the significant effect of welding variable on the
tensile strength was the gas flow rate, while the current was on the critical buckling load. The
results are confirmed and given the optimum values.
Research limitations/implications: The influence of MAG welding variables (current,
wire feeding speed and gas flow rate) on the tensile and buckling strengths of steel will be
investigated in order to avoid the failure of many welded assemblies in the structures due
to the buckling, in addition to reduce the requirement of long time and high cost to produce
such assemblies. Therefore, it is necessary to find a solution to encounter the difficulties in
their welding process.
Practical implications: The major challenge was how to reduce the time and cost beside
gaining the optimum properties through the designed experiments.
Originality/value: The results may be helpful to design any welded joints in machine
frames, structural steel connections and crane structures at the optimum condition.
Effect of Droplet Transition on the Dynamic Behavior of the Keyhole during 6061 Aluminum Alloy Laser-MIG Hybrid Welding
