1. Binciken bayyanar kayan aikin gwiwar hannu: gabaɗaya, duban gani shine babbar hanyar. Ta hanyar dubawar bayyanar, an gano cewa lahanin bayyanar walda na kayan aikin bututun gwiwar hannu ana gano su ta gilashin ƙara girman sau 5-20 wani lokaci. Irin su undercut, porosity, weld bead, ...
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