[TheForge] Forge welding

[Lynn and Susan Lang]

Hello
Am having a difficult time seeing what is happening when welding, I
think I have it figured out, keeping the scarf clean is a requirement,
heat to red, wire brush and flux. 

The books all mention strike lightly when joining and hit harder as you
continue...So what am I to see as I hit lightly, and what visual clues
that it is now time to strike harder..

Is there a detailed description available?

Thank you
lynn