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Learn about the welding methods for copper tubes.

Release time:

2018-06-26

Brass pipes are a common type of non-ferrous metal pipe in our daily lives; they’re also known as copper pipes. Brass pipes feature characteristics such as light weight, excellent thermal conductivity, and high strength at low temperatures, which is why they’re often used in welding applications. Brass pipes are a common type of non-ferrous metal pipe in our daily lives; they’re also known as copper pipes. Brass pipes feature characteristics such as light weight, excellent thermal conductivity, and high strength at low temperatures, which is why they’re often used in welding applications. So, what are the methods for welding brass pipes? Let’s find out together with us!

Common welding methods for copper tubes include manual arc welding, gas welding, and manual tungsten inert gas (TIG) welding; furthermore, automatic welding can also be used for large-scale structures.

I. Manual Arc Welding

1. Before manual arc welding, the edges around the weld area should be cleaned, and the thickness of the workpiece must exceed 4 millimeters. Preheating is mandatory before welding, with a typical preheating temperature ranging from approximately 400 to 500°C.

2. During welding, a short arc should be used, and the electrode should not be swung laterally. When the electrode moves in a reciprocating straight line, it can improve the weld bead’s formation.

3. Welding should be carried out in a well-ventilated area to prevent copper poisoning. After welding, use a flat-head hammer to tap the weld seam to relieve stress and improve weld quality.

II. Gas Welding

The most commonly used joint type for welding copper tubes is the butt joint; lap joints and T-joints should be used as sparingly as possible. During gas welding, two types of filler wires can be employed: one contains deoxidizing elements, while the other consists of ordinary copper wire or strips cut from the base material. When gas welding copper tubes, a neutral flame should be used.

III. Manual Argon Arc Welding

1. Before performing manual argon arc welding on copper tubes, the oxide film, oil, and other contaminants on the edges of the workpiece and on the surface of the welding wire must be thoroughly cleaned to prevent defects such as porosity and slag inclusion. There are two methods for cleaning: mechanical cleaning and chemical cleaning.

2. Based on the plate thickness and groove dimensions, the assembly gap for butt joints of copper tubes should be selected within the range of 0.5 to 1.5 millimeters.

3. This type of welding typically employs direct current, straight polarity—that is, the tungsten electrode is connected to the negative terminal. To eliminate porosity and ensure reliable fusion and penetration at the weld root, it is essential to increase the welding speed, reduce argon gas consumption, and preheat the workpiece. When the plate thickness is less than 3 millimeters, the preheating temperature should be between 150 and 300°C; when the plate thickness exceeds 3 millimeters, the preheating temperature should be between 350 and 500°C. It is important to note that the preheating temperature should not be too high, as this could otherwise degrade the mechanical properties of the welded joint.

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