daleyd
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A very technical answer (as I would expect from yourself Richard!!) but the question specifically asked for the effects on health and safety - which would be impossible to answer without knowing what you are welding - other than to say if it went wrong on something structural then the effects would be bad. As wozzah said it sounds a bit like a question from a course.Been more specific then.
Traveling too fast equates to very low heat input which generates hardness and a brittle HAZ
Too slow has the opposite effect. High heat input large grain structure in the weld and the result is low mechanical toughness. Too much wire speed can result in a cold weld if it's highly exaggerated as you chill the pool with high amounts of cold metal. But it can also lead to burn through as wire speed increase increases penetration. Too little wire feed gives lack of penetration. Voltage gives arc spread and generally increasing it too far beyond the rate of wire been fed in causes undercut. Too little volts and cold laps, lack of fusion are the effects. These are the common effects of going too far/not far enough with the basic settings.