If you did this job yourself, I don't mean to offend you. It will do the job, I don't seel any soot leaking, so it might just be fine.
BUT....if you paid someone to do that job, I hope you didn't pay more than $20.
I am by FAR a professional welder, but I have done exhaust work with my little flux core welder. I can tell by the welds, yours was done with a wire feed flux core or a SMALL stick.
The welds don't look to have any penetration and will most likely crack.
As I said, I am by no means a pro welder, but I have built several exhaust systems from scratch pipes, and elbows I bought.
This is the system I just threw together on my truck to get it past inspection. I am going to build my own 3.5" exhaust to exit in the factory location on the new crew cab and I will gladly show you what I will do for each joint and section.
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As you can see, the welds are smooth and lay flat....that means the weld was hot enough to get a good bite into teh pipe and will prevent ay crasks from vibration and potholes.