Every character on Jiǎoluò Shūwū read as wei in any tone — 2 readings total across the four tones. Pick the tone you mean.
If you have the sound wei but not the character, here are the 2 characters read this way: 危 (wēi, danger, peril, precarious, lofty height), 为 (wéi, to do; to act; for; because of). They split across 2 tones, so the tone is what separates them.