Inverter Welder Arc Stength

I am a novice welder and have previously been using an old arc welder to join metal. I won't call it welding as what I do certainly doesn't look like welding :U



I have now been given a DC Inverter welder but it has two settings on the front. Arc Force in Amps and Current in Amps. I understand the Current setting but how does the Arc Force relate to welding??



Any help appreciated.



Thanks,



Jason