The spelling of the word "Welker" can be explained using the International Phonetic Alphabet (IPA). The first sound in "Welker" is the "w" sound, represented by the symbol /w/. The second sound is the "eh" sound, represented by the symbol /ɛ/. The next sound is the "l" sound, represented by the symbol /l/. The final sound is the "k" sound, represented by the symbol /k/. Therefore, the spelling of "Welker" matches the pronunciation /wɛlkər/.