Cut-off wheels for Grinders 4-1/2 and or 7/9"

[schiker]

I am thinking of buying a diamond grit or diamond segmented wheel for metal (steel) cut-off purposes. Will be welding on cuts ends. Anything to watch out for? Anyone had bad service from amazon diamond blades. Any brands to avoid?

From this I assume diamond is ok. Other interesting thing is use silicon carbide not aluminum oxide to remove mill scale.

 

[Twisted Steel Performance]

I use the diamond disc, they clog up on aluminum but work good on steel and don't contaminate when tig welding... I use a needle scaler if there is heavy scale...