Stress the WH word or not?

[zoltankr]

Hi, the question: What happened? phonetically looks like [ wʌt ˈhæp ənd? ]. It's a three syllables question with stress on the second syllable. But I'm not sure if the interrogative word need any stress or not. As far as I know WH words are usually stressed, but I'm not sure if it applies in all situations. I would be grateful for any suggestion. Thank you.

[Daniel]

It depends on context and emphasis. Right? But neutrally, no, the WH word is not stressed.

[zoltankr]

When I see someone entering a room and he or she cries, and I ask: "What happened?" in this situation 'What' don't need the stress. Am I right?

[Daniel]

Yes. Unless it's an echo question confirming known info.