{HEAD ~ the third step} of arranging another member on the joining layer and heating {TAIL ~ the joining layer} to not less than a temperature which is a melting point of boron oxide for a predetermined period of time 
of heating
{ HEAD ~ the third step } of arranging another member on the joining layer and heating { TAIL ~ the joining layer } to not less than a temperature which is a melting point of boron oxide for a predetermined period of time
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH