Ok, first question, what is the material spec?
If itís a chrome moly steel you just can't fly into it.
To do a high quality job tig welding with proper preparation is required.
A matching or as close as possible matching filler material must be used.
Pre-heating is also required along with a specific rate of cooling.
A qualified welder should be doing this work with if possible a pre-qual weld done and inspected by x-ray or etching for quality assurance before proceeding.
Ripping into it with a "temporary weld" is taking your life into your hands.
Doing this can make the situation worse.
Get the opinion of a certified professional automotive engineer before proceeding giving you all the required certifications for insurance purposes as required.
In the mean time donít ride it until itís repaired professionally, your life and that of other road uses is at risk not to mention the liability when your insurance company find out and leave with a life enduring financial legacy.