Broken lock

Dear locksmith experts. Locking mechanism broke down recently in slide doors and could not find replacement part. Not even sure what to type to search engine. I went through lots of forums and shop sites with no luck.
Anyone could shed some light what is name of the part and where to get replacement?
If I won't be able to find replacement I guess welding is last resort, before replacing whole locking mechanism.
Thanks in advance.

 

Thanks for quick reply.

 

Thank you guys!
Much appreciated.