Plastic-coated steel pipe is a common pipe material widely used in construction, engineering, and other fields. For the welding of plastic-coated steel pipes, a detailed analysis will be given below.
First of all, the prerequisite for welding plastic-coated steel pipes is to ensure that the surface of the pipe is clean. Generally speaking, oil, dust, and other impurities on the surface of the pipe need to be removed before welding to ensure the quality of the weld. Solvents or cleaning agents can be used for cleaning to ensure the cleanliness of the pipe surface.
Secondly, there are two main ways to weld plastic-coated steel pipes: manual welding and automatic welding. Manual welding is suitable for small construction or repair jobs, while automatic welding is suitable for large projects or continuous production situations.
1. Manual welding Manual welding mainly includes two methods: arc welding and gas welding.
(1) Arc welding uses an arc to heat the workpiece to melt it and then connects the welding material to the workpiece in the molten state. First, you need to select appropriate welding materials, such as welding rods or wires, according to the material of the pipe, and operate them with an electric welding machine. During the welding process, the welding material needs to be evenly applied to the weld and then heated using the arc generated by the electric welding machine to melt and connect the welding material and the workpiece.
(2) Gas welding Gas welding uses a flame to heat the workpiece to a certain temperature, and then connects the welding material to the workpiece in a hot state. Gas welding is generally performed using an acetylene oxygen furnace. First, the surface of the pipe needs to be heated and cleaned, then the welding material is evenly applied to the weld, and then the flame generated by oxygen and acetylene is used for heating so that the welding material and the workpiece are melted and connected. Together.
2. Automatic welding Automatic welding mainly includes two methods: submerged arc welding and argon arc welding.
(1) Submerged arc welding Submerged arc welding uses an arc to heat the workpiece to achieve melting and then connects the welding material to the workpiece in the molten state. Compared with manual welding, submerged arc welding can achieve a continuous and efficient welding process. During the submerged arc welding process, a welding machine and welding wire are required to operate, and the welding quality is controlled by adjusting the welding current and welding speed.
(2) Argon arc welding: Argon arc welding uses the protective gas generated by argon to form a suitable atmosphere, heat the workpiece and welding material to a molten state, and then connect the welding material to the workpiece. Argon arc welding has the advantages of clean welds and high welding strength and is suitable for situations where high welding quality requirements are required. During the argon arc welding process, you need to use a welding machine and welding wire to operate and control the welding quality by adjusting parameters such as argon gas flow and welding current.
During the welding process of plastic-coated steel pipes, you need to pay attention to the following points:
① During welding, keep the weld seam clean and control the welding temperature and welding speed to ensure welding quality.
② During the welding process, pay attention to ensure that the welding environment is well-ventilated to avoid harmful gases generated by welding that harm workers.
③After welding is completed, the welds need to be inspected and the welding points should be anti-corrosion treated to extend the service life of the plastic-coated steel pipe.
To sum up, the welding of plastic-coated steel pipes is an important and complex process. Proper use of appropriate welding methods and tools, and good control of welding parameters can ensure the welding quality and service life of plastic-coated steel pipes.
Post time: May-17-2024