Q : HFW and ERW
- High-frequency welding(HFW) is a solid resistance heat energy. The use of high-frequency current welding resistance heat generated in the workpiece so that the workpiece is heated to melt the welding area or near the surface of the plastic state, then applied (or not applied) forging force and achieve a combination of metals. Electrical resistance weld(ERW) is the combination of applying pressure to the workpiece through the electrode, a method using welding current through a resistor in thermal contact with the joint surface and the surrounding area generated.
Q : Hot-rolled and Cold-drawn
- Hot-rolled is based on the slab (billet) as raw material, heated by a roughing mill and finishing mill group made of steel. From finishing the last one out of the hot strip mill by laminar cooling to the set temperature, the coiling machine rolled steel strip coils, steel roll cooled through different finishing line processing and become steel, flat volume and slitting steel products. Cold drawn means at room temperature, after cold-drawing, bending, drawing and other cold strip into the processing of various types of steel.
Q : Hot Galvanized and Cold Galvanized
- Hot galvanized is at a high temperature to melt the zinc in put some supplementary material, then dipped galvanizing bath metal structure so attached to a layer of zinc coating on the metal components. Hot galvanized has the advantage of his anti-corrosion ability, zinc coating adhesion and hardness better. Cold-galvanized is the use of the electrolytic apparatus of the workpiece after degreasing, pickling ingredients into a zinc salt solution, and a cathode connected to the electrolysis device; zinc electrolysis equipment is placed opposite the connection plate workpiece positive, power, the use of current from the positive electrode to the negative electrode of the directional movement, it will deposit a layer of zinc on the workpiece.