Hello,

I'm wondering if building up a press-fit seat is an appropriate application for spray welding. I don't know much about it, but based on what I've seen I believe the cold process is preferable to not damage the 4140 annealed stock of the shaft. The application is a narrow gauge railroad wheel, where the diameter of the press-fit seat is 4" and the interference is supposed to be 0.004" but ended up as 0.002". If spray welding is acceptable here I could save the railroad museum several hundred dollars for buying a new axle. If this is structurally acceptable, would the surface be machinable (I'm assuming that more than 0.001" would be added and it would have to be machined down again)? There is a local shop with spray welding capability so I will inquire with them as well.

Thanks in advance,

Jason