Scaling Removal Technique and Hot Fusion Joint for Medium Frequency Bends
In the production and processing of medium-frequency bends, as customer requirements become increasingly stringent, various aspects of production and processing technologies are gradually advancing to higher levels. Choosing the right processes can not only save the production cost of pipelines but also help maintain the quality of the pipeline. Scaling removal technology is a new production and processing technology that can effectively enhance the corrosion resistance of pipelines. Let's provide a detailed introduction.
1. Scaling removal refers to the mechanical or chemical removal of the surface's iron oxide scale on the medium-frequency bend during processing. The quality of the steel strip surface depends significantly on the effectiveness of scale removal. Scale removal equipment operates independently, using high-pressure water and iron sand splashing descaling in the cold rolling mill to remove the iron oxide scale from the surface of the steel strip. With the advancement of technology, the two are organically linked and become the annealing descaling unit.
2. When acetic acid content is high, austenitic manganese pipe materials with molybdenum and copper should be selected. Pure acetic acid has weak scaling removal capabilities and no local corrosion. However, during production, storage, transportation, use, and processing, the presence of impurities can lead to accelerated corrosion of medium-frequency bends sensitive to pitting. With the increase of acetic acid temperature and concentration, corrosion intensifies.
After some time in use, the surface of the medium-frequency bend may develop oxidized iron scales. These iron scales are prone to fall off and can be challenging to clean. Additionally, they do not provide any benefits to the pipeline; therefore, it is necessary to remove them promptly, enhancing the performance of the pipeline.
Hot Fusion Joint for Medium-Frequency Bends
The hot fusion joint of medium-frequency bends and fittings is a task that many manufacturers need to perform during construction. It requires a high-temperature environment, and there are several tasks to be performed for hot fusion jointing:
1. After heating is completed, the connection components and the heating tool should be separated quickly, and the uniformity of the heated surface and the presence of any damage should be checked.
2. The connecting ends at both ends of the joint should extend from the welding fixture a certain amount of free length, and the two corresponding connection locations should be straightened to ensure that the misalignment on the same axis is not greater than 5% of the wall thickness of the medium-frequency bend's rotating joint.
3. The connection should have an outer flange that is smooth and symmetrical along the circumferential plane of the pipe section. The depth of the flange at the bottom should not be less than the depth of the outer surface of the joint.
4. The contact surface of the medium-frequency bend's rotating joint should be in full contact under uniform external force, forming a flange. The shape of the flange should be uniform and consistent, free from pores, bubbles, and cracks.
Medium-frequency bends have various connection methods, and hot fusion jointing utilizes specific heating conditions to achieve a connection between them, addressing issues such as insufficient pipeline length.
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