 Nyorai kupfuurira kweiyi ndima - Mukati ma193536, Welker akashanda kuUnited States of America senyanzvi pamabasa ouchenjeri. Pakati paApril 1936 naMay 1937 akanga achishanda pakiriniki yeMoscow Orthopaedic. Zvadaro, pakati pa1937 na1941 akashanda semudzidzisi wemitauro neSoviet Union, akazova mudzidzisi pachikoro chehondo cheMoscow, achienda nechikoro kuStavropol apo chibvumirano chaHitler-Stalin chisina kurwisarakashanduka kuva rakashata. Munguva ya194243, akava mudzidzi akapedza kudzidza pa Comintern Academy muKushnarenkovo. Ikoko kwakateverwa nokudzidziswa kwenyanzvi yeparachute-agent kubva kwaakabuda semukuru mukuru weRed Army. Mukati 1944, Welker akashanda somudzidzisi pedyo pamberi mutsetse pamusoro pakatarisana panguva dzakasiyana pamatanho pamusoro Kholm uye Opochka. Akanga achibatanidzwawo mukugadzirira kwekupinda kumaguta eGermany. 