Recent postsView all

Unit Plans
1 Jun 19
Getting started?
26 May 19
Practical work (and Paper 3)
17 May 19
Group 4 Project
11 May 19
Single slit distraction
8 May 19
Extended Essay
4 May 19
25 Apr 19
IA 2019 reflections
20 Apr 19
20 Apr 19
Individual investigation
12 Apr 19
5 Apr 19
1000 questions
30 Mar 19

More about MIG (1)

Friday 29 December 2017

Last post I mentioned my new hobby, classic car restoration. This involves replacing rusted metal with shiny new metal and that means welding so I bought a welding machine. It's a MIG welder which stands for metal inert gas. The principal is that a thin wire is fed out of a nozzle onto the workpiece. The wire is at about 30 V and the workpiece is earthed so a current flows, the size of the current depends on the resistance of the wire which is related to it length so the longer the length of wire the lower the current and since power = VI, less current means less heat per second resulting in a lower temperature and a poor weld.


To post comments you need to log in. If it is your first time you will need to subscribe.