Abstract:Abstract摇The quality of spot welds in 1mm SUS304 austenitic stainless steel sheet metal was evaluated by using
ultrasonic water immersion focusing method. The specifics of nugget diameters and the ultrasonic C鄄scan image were
analyzed under different welding process parameters. Furthermore, the tensile鄄shear tests were carried out to examine
the mechanical behavior of sport welds. Results show that the C鄄scan image can get nugget diameter and effective in鄄
formation from the inner pattern of the spot weld based on ultrasonic water immersion focusing method. When the
welding current is 4 kA and the supply pressure is 0. 15 MPa, it can get the information which included splash, solder
to wear and other weld defects from the ultrasonic C鄄scan image. When the supply pressure is 0. 45 MPa, the nugget
diameter is increasing. But the excessive supply pressure leads to the joint thickness decreasing and the joint quality is
failing. When the supply pressure is 0. 4 MPa and the welding current is 9 kA, the failure strength and energy absorp鄄
tion value decrease rapidly, it can get the information which includes splash, solder to wear and other weld defects
from the ultrasonic C鄄scan image
