After Kristallnacht in November 1938, Weltlinger was jailed for two months in the concentration camp of Sachsenhausen. From March 1939 to February 1942, he worked at the Jewish Community of Berlin and was responsible for the administration and collection of emigration and Theresienstadt home shopping duties. Non-Jewish friends and family hid Weltinger and his wife, Margaret, until the end of the war in their Berlin half-room apartment.
