In July, Welter claimed two United States Army Air Forces (USAAF) Boeing B-17 Flying Fortress four-engined bombers and three North American P-51 Mustangs, two of which claimed on 19 July between Munich and Memmingen, shot down by day. From 25 July 1944, Welter served with 1. "Staffel"/"Nachtjagdgruppe" 10 (NJGr 10) performing further "Wilde Sau" missions. He claimed four Royal Air Force (RAF) Avro Lancaster four-engine heavy bombers shot down on the night of 29 August 1944 to record his 24th through 27th victories.