spot welds rusting
spot welds rusting
(OP)
Hello
We are getting a lot of rust on one of the products we spot weld. The rust is only on/around the spot welds. Picture is attached.
From my understanding this happens because the heat of the weld in a oxidizing environment (ie open air spot weld/unsheilded) will:
1. burn off the millscale layer exposing bare steel to the environment.
2. change the microstructure of the weld metal/HAZ making it more susceptible to rust.
Can any one else explain this more thoroughly? and if possible suggest any solutions?
Thanks
We are getting a lot of rust on one of the products we spot weld. The rust is only on/around the spot welds. Picture is attached.
From my understanding this happens because the heat of the weld in a oxidizing environment (ie open air spot weld/unsheilded) will:
1. burn off the millscale layer exposing bare steel to the environment.
2. change the microstructure of the weld metal/HAZ making it more susceptible to rust.
Can any one else explain this more thoroughly? and if possible suggest any solutions?
Thanks





RE: spot welds rusting
The spot weld is burning this off. You would need to re oil or re-spray the part right after spot-welding to prevent this.
B.E.
You are judged not by what you know, but by what you can do.
RE: spot welds rusting