Tegishli oqimni tanlash payvandlash materiali, isitish usuli va jarayon sharoitlari kabi omillarga bog'liq. Tegishli oqimni tanlashda quyidagi omillarni hisobga olish kerak:
1. Payvandlash materialining turi va qalinligi;
2. Isitish usuli;
3. Payvandlash harorati;
4. Atrof-muhit sharoitlari;
5. Kerakli payvandlash tezligi va nuqson tezligi.
