Welcome and thanks for showing your fine collection.
From what I know of Luger repair/welding, the generally accepted way to weld small amounts of metal onto Luger parts is TIG welding. You can search on the internet re: that process.
My local gunsmith (TJ's Gunsmithing Aurora CO) does TIG welding I believe and is comfortable working on Lugers. TIG welding requires skill and equipment; a high quality gunsmith in your area might be able to weld/repair the part.
Beyond getting it fixed - I would suggest you investigate why it broke. A mainspring that is too weak can allow the breech bolt to slam into the rear of the pistol, causing the damage you have sustained. That's not a diagnosis, but a suggestion so you don't get it repaired only to have it break again.
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