Welding Problems - Cracks & Distortion! A how not to do it video...

A few things to take from this video.
First, tack EVERYTHING in place before doing any "proper" welds. On this piece I should have tacked the centre tube & all the ribs in position.
Second, trying to run a fused weld between 2 pieces of 5mm thick mild steel will have hardly any penetration...
Third, MIG welding mild steel is much quicker & puts less heat into the job than TIG.
Fourth, don't overdo things. If a part is only there to hold some trim on, tack welds will do. If the weld can be ground off or it's going to be painted or covered, it doesn't have to look great...