Metal fusion bonding – Process – With shaping
Patent
1988-09-21
1990-01-30
Seidel, Richard K.
Metal fusion bonding
Process
With shaping
228171, 2281737, 228265, 29155R, B23K 2004, B23K 3108, B21D 506, K04C 308
Patent
active
048968188
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to metallurgy and has specific reference to methods of fabricating light-weight sections.
The disclosed method can be of particular utility in manufacturing trusses, columns, girders and other structural members for various industrial fields.
PRIOR ART
Widely known is a method of fabricating light-weight sections from rolled stock. Accordingly, a rolled blank, e.g. a channel or I-beam, is slit in a zigzag course into two members which are disengaged and joined at the projections of the zigzag edges, followed by welding to produce a light-weight section. Hot rolled stock lends itself to working by this methods. However, the prior art method of fabricating light-weight sections incurs significant losses of metal. Moreover, since suitable for working in this case are only channels, I-beams and zee beams, the range of light-weight sections fabricated by the prior art method is a limited one.
Also known is a method of fabricating light-weight sections according whereto a strip is uncoiled, levelled, bent into a section, divided into given lengths, slit in a zigzag course into members which are matched to obtain sections with an alternating cross-sectional area and welded together (Yan Brudka et al. "Low-weight Steel Sections", Stroiizdat Publishers, Moscow, 1974, p. 320-325).
This method is applicable to fabricating low-weight sections from bent ones. However, by analogy with the above mentioned prior art method, only a limited range of products can be so produced. Apart from that, to practise low-waste production techniques and render continuous the process of slitting the bent sections in a zigzag course, these sections are welded to each other into a single line. The welding and the preparation of end faces for welding require extra equipment, tools and labour.
Since involved in the zigzag slitting is a wall of a bent section which has been preformed from a strip, internal stresses are set up, causing warping. To avoid this until the members are fully joined at the projections of their zigzag edges, metal intensive equipment (live-roll tables, satellite outfit) is required.
A wall of a bent section can be slit only along a single zigzag line. Therefore, a limitation on the height of light-weight sections is imposed.
To join the slit members of bent sections at the projections of their zigzag edges, the recourse is either to arc welding or CO.sub.2 -shielded semi-automatic welding which need extra materials (electrodes, welding wire, carbon dioxide). Numerous items of welding equipment are required in order to enable a production line materializing the prior art method to operate at a specified rate of output.
If pressure welding is employed, involving a heating up of the zigzag edges followed by forcing out the oxides in the form of flash, the height of the wall of light-weight section diminishes. Residual stresses existing in members of bent sections and welding deformation, lack of ready-made sized low-weight sections lead to distortion of geometrical shape and poor quality of product.
SUMMARY OF THE INVENTION
The principal object of the present invention is to provide a method of fabricating light-weight sections according whereto all the operations are sequenced and carried out so as to adapt the process to streamlined manufacture, render it a low-waste one, continuous and fully automated, capable of turning out a wide range of quality products.
This object is realized by disclosing a method of fabricating light-weight sections consisting in uncoiling a strip, levelling it and bending into a section, dividing this into given lengths, slitting the lengths in a zigzag course so as to obtain members, matching the members so as to obtain a section with an alternating cross-sectional area and welding the members together, whereby according to the invention preparatory to bending the strip it is slit in a zigzag course into at least two members, the path of travel of at least one thereof is changed, the members so produced are matched at the edges in the sam
REFERENCES:
patent: 3874051 (1975-04-01), Malik
Davydov Leonid S.
Sagirov Alexandr V.
Shteinbok Igor L.
Shteinbok Lev Z.
Heinrich Samuel M.
Opytnoe Proizvodsyvenno- Tekhnicheskoe Predpriyatie "Energotekhp
Seidel Richard K.
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