Why is red copper hard to weld
Jun 27, 2022
Red copper, or red copper, is not difficult to weld. The welding methods of red copper include gas welding, manual carbon arc welding, manual arc welding and manual argon arc welding, and automatic welding can also be used for large structures.
1. Gas welding of red copper
Welding red copper is the most commonly used butt joint, lap joint and T-joint as little as possible. Two kinds of welding wire can be used for gas welding, one is the welding wire containing deoxidation elements, such as wire 201, 202; The other is the general copper wire and base material cutting, using gas agent 301 as flux. Neutral flame shall be used for gas welding red copper.
2. Manual arc welding of red copper
In manual arc welding, red copper electrode copper 107, welding core is red copper (T2, T3). The edges of the welding should be cleaned before welding. When the thickness of welding parts is greater than 4 mm, it must be preheated before welding, and the preheating temperature is generally about 400~500℃. Welding with copper 107 electrode, power supply should be dc reverse connection.
Welding should be short arc, electrode should not be horizontal swing. Welding rod for reciprocating linear motion, can improve the shape of the weld. Step back welding should be used for long welds. Welding speed should be as fast as possible. In multilayer welding, the slag between layers must be completely removed.
Welding should be carried out in a well-ventilated place to prevent copper poisoning. After welding, flat hammer is used to knock the weld to eliminate stress and improve the quality of the weld.
3. Manual argon arc welding of red copper
In red copper manual argon arc welding, the use of wire 201(special red copper wire) and wire 202, also use red copper wire, such as T2. Before welding, the oxide film, oil and other dirt on the welding edge of the workpiece and the surface of the welding wire must be cleaned up to avoid defects such as porosity and slag inclusion. Cleaning methods include mechanical cleaning and chemical cleaning.
When the butt joint plate thickness is less than 3 mm, no groove is opened; When the plate thickness is 3 ~ 10 mm, v-shaped groove is opened and the groove Angle is 60~70º; When the plate thickness is greater than 10 mm, the x-type groove is opened, and the groove Angle is 60~70º; In order to avoid incomplete welding, generally no blunt edge. According to the thickness of the plate and the size of the groove, the assembly clearance of the butt joint is selected within the range of 0.5 ~ 1.5 mm. Red copper manual argon arc welding, is usually the use of DIRECT current connection, that is, tungsten electrode negative electrode. In order to eliminate porosity and ensure reliable fusion and penetration of weld root, it is necessary to increase welding speed, reduce consumption of argon gas, and preheat the weldment. When the plate thickness is less than 3 mm, the preheating temperature is 150~300℃; When the plate thickness is more than 3 mm, the preheating temperature is 350~500℃. The preheating temperature should not be too high, otherwise the mechanical properties of the welded joint will be reduced.
4, there are carbon arc welding of copper, carbon arc welding electrode has carbon electrode and graphite electrode. The welding wire used for carbon arc welding of red copper is the same as that used for gas welding. It can also be cut by the base material and flux of red copper can be used for gas welding, such as gas agent 301.
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