Heat each reinforce bar at cross section by Acetylene and Oxygen mixture gas at about 1,200 – 1,300 degree and put pressure then join each bar family.
Reinforce bar is steel which mixed by atom of iron and carbon. Atom of them in steel is stable at normal temperature and they are making regular agreement.
Gas Pressure Welding stick each reinforce bar by their join of crystal. Then we use heat to make re-arrangement of each atom easily at each reinforce bar joining. Both atoms start to move actively by heating at once and also change structure of crystal as before then diffuse. It means they start to be mixed of each atom.