Advantages: Bar-break feature guarantees fully ductile elongation. No reduction of the bar cross-section area. Material of the rebar coupler is No.45 steel. Working principle: 1.First,We use GQ50 rebar cutting machine to splice up the end of rebar. 2.Secondly,we use Upset Forging Parallel Thread Machine (BDC-Auto1 Machine) to forge the end of rebar. 3.Third, we use Parallel Thread Cutting Machine (LW-I500 Machine) to thread the ends of the rebar which have been forged. 4.Fourth,an upsetting coupler is used to link the two ends of rebar in parallel thread.