I have to join metal to metal (Aluminium or SS piece onto a vertical SS wall) that could take a shear load of say, 600gm with an area of contact of around 2cm^2. The environment is above boiling surface of water. So, the adhesive should be resistant to 100 deg C temperature, and moisture - with water droplets. Check the image for setup. What are the best adhesives for this purpose? I have checked Araldite, but specs say its max temp is around 65 deg C. Any suggestions? Also desirable is if the adhesive is semi-permanent: If I need to remove it and make the joining at any other location, it shouldn't be terribly difficult.
You want to look at high temp RTV silicone adhesives. They can handle temps way above 100c. Typically found and used as make-a-gasket material on engines and commonly found at automotive stores.
Also, I'd like to see you use SS for the bracket to keep your thermal expansion co-efficient the same as the base part..I know it's not a lot of temperature change but it may help.
Lastly, I second the fasteners method per the comments because you will have a captured connection between the two parts.