Projection Welding with HSLA Steel
Projection Welding with HSLA Steel
(OP)
I am working on an automotive application involving welding a 7/16" projection weld nut to 1.8mm High Strength Low Alloy Steel. (SP253-590) I am having a difficult time developing optimum weld parameters to maintain the specified push out requirement. Has anyone done a study on projection welding with HSLA steel or have any suggestions?





RE: Projection Welding with HSLA Steel
Electrode force = 8900 N (2000 lbs)
Weld time = 16-20 cycles
Current = 23-25 K-amps
The required push-off force should be 18680 N (4200 lbs) and the Torque to failure should be 271 Nm (2400 in-lbs). Other parameters are given for different combinations of weld nut geometry and sheet metal thickness. You can obtain this standard from AutoWeb using the following link:
http://afx.autoweb.net/standards/
RE: Projection Welding with HSLA Steel
Does the DC PS-1804 cover different metals Low Carbon, Galanized, Galvanealed, HSLA.....????
RE: Projection Welding with HSLA Steel
I recommend that you stop using the 4-projection square nut and replace it with a suitable 3-projection nut. With 4-projection nuts, often one projection is significantly out of plane. The variable weld cross-section causes welding problems which in turn causes low mechanical properties. An analogy is a table with 4 legs - three legs define a plane with the floor, and one of the legs is out of plane and requires a sugar packet to prevent table movement.
RE: Projection Welding with HSLA Steel
RE: Projection Welding with HSLA Steel
Is your material a "coated material" ie galvaneal, galvanized, hot dip ? as the thickness of coating can have a significant effect on weld integrity.