Just a little note: If you have a repair like this to make, have a CERTIFIED weldor do it! That is, one specifically government licensed for structural welding. Do not use just any clown who claims to know how to wled, or who claims that 'school taught us to those standards,' etc. Get the real deal.
I think back to all the money I've spent on getting NZS 4711 (Structural welding) and it is an on-going thing to
continually say that you hold them certifications(there are different certifications for different weld processes (Stick,MIG and TIG (although TIG is not used in structural stuff, there is a need for certification of those that weld food containers and pipe work that carries edible liquids) and "positions".
Not only is this for you to be taught to weld correctly (which 9/10th's of is actually being able to set the welder so that it will provide the best weld quality, for the given task), but it also includes detailed analysis of samples of welded joints provided by the applicant.
Sure, at the end of the day, no weld is in-fallible, but having monitoring of those that do welding that needs to be of a certain standard, helps to minimise the risk of things breaking un-necessarily.