Flexible powder band for automatic overlay welding

Abstract

The invention pertains to the field of an arc welding method for non-abutting purpose and is mainly applied to the overlay welding of large metal surface. The flexible powder band for automatic overlay welding provided by the invention consists of a metal powder block and a packaging layer. The metal powder block is made from metal powder and adhesive through pressing and sintering. The packaginglayer consists of three materials: the first layer is non-woven cloth, the second layer is braided wire and the third layer is hot melt adhesive film. The non-woven cloth is directly wrapped on the powder block, the braided wire is braided on the non-woven cloth and the hot melt adhesive film is attached on the braided wire so as to bind the braided wire and the non-woven cloth. The raw material for fabricating the non-woven cloth and wire is natural fiber or glass fiber. Compared with the prior art, the invention with cost reduction can achieve not only the high-efficiency overlay welding and even weight of power band laying under various industrial and mineral conditions of overlay welding, thus making the composition of the overlay welding layer more accurate, but also the large-surface overlay welding on the occasion with higher requirements.

Description

technical field [0001] The present invention is in the field of arc welding methods for non-joining purposes. It is mainly suitable for large-area surfacing welding on metal surfaces. Background technique [0002] As we all know, in the case of serious surface wear, in order to prolong the service life of parts, a layer of wear-resistant alloy is often surfacing on the metal surface to improve the surface wear resistance. A certain amount of hardened alloy is often contained in the surfacing layer. Among the several existing arc surfacing methods, each has different characteristics: gas shielded (or slag shielded) powder cored welding strip or powder cored wire automatic surfacing method, which has high surfacing efficiency, stable process and uniform composition , is an ideal surfacing method. However, due to the limitation of the filling coefficient of the welding strip and welding wire itself (generally less than 40%), the alloy content of the surfacing layer is also l...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the powder blocks need to be placed manually, and even the heat source is manually moved, which affects the degree of mechanization of the operation; since the powder blocks are placed before surfacing welding, it is impossible to perform surfacing welding on the surface of the rotating body ; In addition, the position and interval of manual placement cannot be accurate and consistent, which affects the uniformity of the composition of the surfacing layer

However, due to the production method of the flexible belt, problems often occur in the use of the product: In order to prevent the powder from leaking out of the flexible belt, an ultra-thin plastic film is used as the inner layer of the packaging layer, and the metal powder in it cannot be added with a binder because it cannot be cured. So the metal powder is in a flowing state in the flexible bag

When there is no powder belt on the surface of the steel plate before welding, the problem of uneven laying amount caused by the change of the shape of the powder belt will occur

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