I am wondering this because I have seen two articles using different tenses despite being published in one publisher. This question is nothing important but once the reviewer told me it's better to be written using past-tense grammar stuffs.
https://www.nature.com/scitable/topicpage/effective-writing-13815989/
https://www.unr.edu/writing-speaking-center/writing-speaking-resources/how-to-use-tenses-within-scientific-writing
Anton Vrdoljak's answer is excellent. As a linguist I would just add that the use of tenses in scientific articles also depends to a certain extent on the field you are studying, the language you are using and the subject matter your are studying, as different fields in different languages has different discourse traditions and subject matters that are of a historical, diachronic nature require a specific use of tenses.
It may depend on style and content. Writers should just be consistent.
When I have written about my research, it has been in the past-tense because I was looking back at what I had done.
When I wrote my thesis, I used past tense and using a passive voice.
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