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Backing applied to small-caliber steel pipe welding

A small-caliber, steel pipe technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of high price, long personnel training and equipment debugging cycle, large initial investment, etc., and achieve low manufacturing cost and saving the purchase of new The effect of equipment

Inactive Publication Date: 2010-05-19
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if this method is adopted in production, existing equipment must be eliminated and new all-position automatic welding equipment purchased. However, all-position automatic welding equipment currently on the market is expensive, mostly between 1 million and 2 million each, and replacement New equipment will inevitably require a long period of personnel training and equipment debugging, and the initial investment is too large

Method used

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  • Backing applied to small-caliber steel pipe welding
  • Backing applied to small-caliber steel pipe welding
  • Backing applied to small-caliber steel pipe welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Such as figure 1 and figure 2 As shown, a gasket applied to the welding of small-diameter steel pipes provided by the present invention includes an annular base 2, and an annular heat insulating layer 1 is wound outside the annular base 2. The annular base 2 is made of an inorganic salt that is easily soluble in water. As a result, the annular heat insulation layer 1 is made of oxides that are resistant to high temperatures and can react with water. The outer diameter of the annular heat insulation layer 1 is 1-3mm larger than the inner diameter of the steel pipe to be welded, and the outer diameter of the annular base 2 is 5-8mm smaller than the inner diameter of the steel pipe to be welded.

[0016] In this embodiment, the annular heat insulating layer 1 and the annular base 2 are made of magnesium oxide and sodium chloride respectively. The outer diameter of the annular heat insulating layer 1 is 1 mm larger than the inner diameter of the steel pipe to be welded, ...

Embodiment 2

[0020] The structure of this embodiment is the same as that of Embodiment 1, the difference is that the annular heat insulating layer 1 and the annular base 2 are respectively made of MgO and MgCl 2 production. The outer diameter of the annular heat insulation layer 1 is 2mm larger than the inner diameter of the steel pipe to be welded, and the outer diameter of the annular base 2 is 7mm smaller than the inner diameter of the steel pipe to be welded.

Embodiment 3

[0022] The structure of this embodiment is the same as that of Embodiment 1, except that the annular heat insulating layer 1 and the annular base 2 are made of CaO and NaCl respectively. The outer diameter of the annular heat insulation layer 1 is 3 mm larger than the inner diameter of the steel pipe to be welded, and the outer diameter of the annular base 2 is 8 mm smaller than the inner diameter of the steel pipe to be welded.

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Abstract

The invention provides a backing applied to small-caliber steel pipe welding, which is characterized in that: the backing comprises an annular substrate of which the outside is wound with an annular thermal insulating layer; the annular substrate is prepared from water-soluble inorganic salt or oxides capable of reacting with water; and the annular thermal insulating layer is prepared from oxides which are high temperature resistant and can react with water. The backing has the advantages that: expenditures of purchasing new equipment and eliminating traditional equipment can be saved; filed modification, technical training of personnel, debugging of the new equipment and the like are not required; and the welding backing has low manufacturing cost at the same time.

Description

technical field [0001] The invention relates to a liner applied to the welding of small-diameter steel pipes, which is used for A-TIG welding of small-diameter steel pipes. Background technique [0002] A-TIG welding can penetrate steel up to 12mm thick at one time, and has high production efficiency. At the same time, no filler material is needed, and the processing of welding grooves and welding materials is omitted. It has broad application prospects. [0003] In terms of A-TIG welding of small-diameter steel pipes, in view of the characteristics of A-TIG welding, for steel pipes with a wall thickness of less than 6mm, the method of fixing the welding torch and rotating the pipe can be completed at one time. However, for steel pipes with a wall thickness greater than 6mm, there are many disadvantages in this method. First of all, for thick-walled pipes, in the case of the same melting width, there is more liquid metal in the molten pool, and the gravity is greater, but t...

Claims

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Application Information

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IPC IPC(8): B23K9/035
Inventor 杨智问陆权森
Owner SHANGHAI BOILER WORKS