The content of oxygen is extremely low, and the pure copper

01% is called oxygen-free copper, which is indicated by TU (copper-free), such as TU1, TU2, etc.　　Bronze used to call the alloy of copper and tin bronze, but now it calls copper alloys other than brass bronze. When gas welding, neutral flame or weak carbonized flame is used for copper, and weak oxidation flame is used for brass to avoid zinc transpiration. Tungsten electrode hydrogen arc welding uses direct current direct connection. Bronze is indicated by 'Q,' (green). Commonly used are tin bronze, aluminum bronze and sensitive bronze.　　

Aluminum bronze strengthening treatment methods Aluminum bronze is divided into two categories in a certain sense, one is ordinary aluminum bronze, and the other is special aluminum bronze. After quenching and tempering, it can improve hardness.5%, and sometimes also participates in appropriate amounts of iron, nickel, manganese and other elements, aluminum bronze to further improve the function of aluminum bronze. Red copper, tungsten copper, forged red copper, aluminum bronze, phosphor bronze, cup copper. Very good

Brass Copper alloy with zinc as the primary alloying element is called brass. The characteristic is that a is difficult to fuse and easy Deformation; b simple thermal cracking; c simple air pores Red transformer strips copper, tungsten copper, forged red copper, aluminum bronze, phosphor bronze, cup copper. Pure copper is indicated by the letters +T}} (copper), such as Tl, T2, T3, etc. The content of oxygen is extremely low, and the pure copper not more than 0. Welding of copper and copper alloys is mainly selected by gas welding, inert gas maintenance welding, submerged arc welding, brazing, etc. And use large line energy welding. Brass with +H; (yellow) indicates such as H80, H70, H68, etc.Classification and welding characteristics of copper and copper alloys Pure copper Pure copper is often referred to as red copper. Copper and copper alloys have good thermal conductivity, so they should generally be preheated before welding. It has outstanding electrical conductivity, thermal conductivity and corrosion resistance