There are many welding methods of heavy copper board, and different welding methods of copper products are also different.
The commonly used methods include gas welding, manual carbon arc welding, manual arc welding and manual argon arc welding. Automatic welding can also be used for large structures.
Now we will use copper and brass as examples to explain the differences of the above four welding methods, hoping to help you deepen your understanding of the related copper art.
Method of welding heavy copper board
(1) Gas welding
Red copper gas welding red copper (commonly known as industrial copper) is the most commonly used butt joint.
Gas welding can be used wire, one is containing deoxidized elements of the wire, such as wire 201, 202; The other is the general red copper wire and base material cutting, using gas agent 301 as flux.
Due to the low temperature of gas welding flame, the evaporation of zinc in brass is less than that in electric welding, so in brass welding, gas welding is the most commonly used method.
Brass gas welding wire has: wire 221, wire 222 and wire 224, these wire contains silicon, tin, iron and other elements, can prevent and reduce the evaporation and burning loss of zinc in the weld pool, is conducive to ensure the weld performance and prevent the formation of pores.
The commonly used fluxes of gas welding brass are solid powder and gas fluxes. Gas fluxes are composed of borate methyl ester and methanol. Flux such as gas agent 301.
(2) Carbon arc welding
Carbon arc welding of red copper uses carbon arc welding electrode with carbon electrode and graphite electrode.The welding wire used by red copper carbon arc welding is the same as that used in gas welding. It can also be used to cut strips of base material and flux used for gas welding of red copper, such as gas agent 301, etc..
Brass carbon arc welding brass carbon arc welding, according to the composition of the base material choose wire 221, wire 222, wire 224 welding wire, also can use homemade brass welding wire.Welding agent 301 can be used as flux.Welding should be performed in short arcs to reduce evaporation and burning of zinc.
(3) Manual arc welding
The manual arc welding of red copper adopts copper 107 with red copper electrode and red copper core (T2, T3).The power supply should be dc reverse connection.
Welding should be short arc, welding rod should not be used for lateral swing. Reciprocating linear movement of the electrode can improve the weld forming.
Long welds shall be backwelded step by step. The welding speed should be as fast as possible. During multilayer welding, slag between layers must be thoroughly removed. Welding should be done in a well-ventilated place to prevent copper poisoning.
After welding, the flat head hammer should be used to knock the welding seam to eliminate the stress and improve the quality of the welding seam. When the thickness of the welding piece is more than 4 mm, it must be preheated before welding, and the preheating temperature is generally around 400~500℃.
Manual arc welding of brass brass in addition to using copper 227 and copper 237, you can also use homemade welding rod. Direct current power supply is used, welding rod is connected with negative electrode.
The surface of welding parts should be carefully cleaned before welding. Groove angle should not be less than 60~70o generally, because to improve the weld forming, so the welding parts to preheat 150~250℃.
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Post time: Sep-11-2019