Weld Stud Integrity
Weld Stud Integrity
(OP)
I propose to use a 4-40 UNC weld stud as a replacement for a length of studding in a tapped hole. Although the weld stud principle is well documented, I haven't yet found a definitive answer to this question:
Is it only the fused pip of the stud which provides the strength or does the welded area extend across the whole face of the stud? I suspect the former is true and that the weld witness seen around the periphery of the stud face is not actually adherent and doesn't add to the strength of the joint.
Any ideas please? Many Thanks.
Jim
Is it only the fused pip of the stud which provides the strength or does the welded area extend across the whole face of the stud? I suspect the former is true and that the weld witness seen around the periphery of the stud face is not actually adherent and doesn't add to the strength of the joint.
Any ideas please? Many Thanks.
Jim





RE: Weld Stud Integrity
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
email: sayee_prasad@yahoo.com
The whole of science is nothing more than a refinement of everyday thinking!!!
RE: Weld Stud Integrity
Although we have CD stud welding equipment 'in house', the design engineer who introduced it is long gone. From the point of view of a practical engineer I can easily relate to the weld pip being melted and fusing in the 2 - 5 ms that I believe the discharge lasts, but it is much less obvious to me that in such a short time period the whole of the stud face and opposing surface will have time to melt to take part in the welding process.
I am expecting some sample weld studs to arrive sometime. When they do we will be able to perform pull tests and section the weld to see for ourselves what is going on.
Thanks again.
RE: Weld Stud Integrity
In another version of stud welding, the power source used is same as that for SMAW welding,requires a ceramic ferrule to concentrate the arc and prevent air influx and contain the molten metal. The former method is normally used as it can be used for bigger diameter studs too with relative ease, whereas the latter version known as Arc Stud welding can be used only for small to medium diameter studs.
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
email: sayee_prasad@yahoo.com
The whole of science is nothing more than a refinement of everyday thinking!!!
RE: Weld Stud Integrity
You have given me much more confidence that using a weld stud will provide the best solution to my design problem.
Regards
Jim
RE: Weld Stud Integrity
According to our inspector for the New York State D.O.T. and Nyc Dept.of Bridges, the standards for a design rated stud are "the stud must be able to be bent at a minimum of 45 deg.to plate surface without failure". This is usually done by hydraulic force, although it can be done by a hammer with a bit more effort.Those same standards also require 10% of the studs be tested.
As for stud welding being practical,if all procedures are followed,and the above mentioned testing is done,stud welding is a very cost effective way to go.
RE: Weld Stud Integrity
Thanks again everyone who responded.
Jim