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Method for achieving vacuum in composite blank assembly welding process

A realization method and a composite billet technology, applied in welding equipment, metal processing, metal processing equipment, etc., can solve the problems of difficulty in maintaining the vacuum state of the joint surface of two slabs and reduce the composite quality of the joint surface, so as to promote dissipation and avoid Welding oxidation, the effect of improving composite quality

Active Publication Date: 2014-12-17
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

[0003] The traditional welding method can also seal the surroundings of the slabs, but it is difficult to maintain the vacuum state at the joint surface of the two slabs
Since the traditional welding method is exposed to the air, the heat input during the welding process will also heat the slab. When the slab has a certain temperature, the fresh metal after the original surface cleaning will also accelerate the adsorption of oxygen in the air. On the surface of the slab at the joint surface, the composite quality of the joint surface will be reduced during the rolling process

Method used

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  • Method for achieving vacuum in composite blank assembly welding process
  • Method for achieving vacuum in composite blank assembly welding process
  • Method for achieving vacuum in composite blank assembly welding process

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Embodiment Construction

[0028] see figure 1 , a method for realizing vacuum during welding of a composite billet assembly of the present invention, comprising the steps of:

[0029] 1) Backup board

[0030] Take two slabs 1 and 2, clean the iron oxide scale on the surface of the slabs, and process chamfers around the joint surface A of the slabs to form a groove 3, and then place the cleaned surfaces of the two slabs 1 and 2 face to face in the air;

[0031] 2) Closed welding in the early stage

[0032] Weld two slabs 1 and 2 groove 3, welding at least three layers, each layer thickness 3mm-10mm, to ensure the airtightness of the surrounding welds; during this period, reserve an access hole in the weld;

[0033] 3) Vacuum extraction

[0034] Use a mechanical vacuum pump to enter the access hole reserved for the weld to draw a vacuum between the two slabs, and draw the vacuum to below 10Pa, and then use a molecular vacuum pump to continue to draw the vacuum to below 0.01Pa;

[0035] 4) Two-step w...

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Abstract

The invention provides a method for achieving vacuum in the composite blank assembly welding process. The method includes the following steps that firstly, plates are prepared, namely, two plate blanks are taken, oxide scales on the surfaces of the plate blanks are completely removed, chamfers are machined in the peripheries of the combined surfaces of the plate blanks, and then grooves are formed; secondly, earlier-stage closed sealing is conducted, namely, the grooves of the two plate blanks are welded for at least three layers; thirdly, vacuumization is carried out, namely, a mechanical vacuum pump enters the position between the two plate blanks from a connecting hole reserved in a welding joint to conduct vacuumization, the vacuum degree is below 10 Pa after extraction, and then a molecular vacuum pump is used for continuous vacuumization until the vacuum degree is below 0.01 Pa; fourthly, two-step welding control is conducted under the vacuum condition. Vacuum between the two assembled plate blanks can be guaranteed, oxygen molecules adsorbed to the combined surface of the plate blanks are fewer, and then the composite quality of combined interfaces after composite rolling is improved.

Description

technical field [0001] The invention relates to the technical field of composite thick plate manufacturing, in particular to a method for realizing vacuum in the welding process of composite blank assembly. Background technique [0002] Most of the iron and steel production enterprises at home and abroad that produce thick plates by compound rolling method adopt vacuum electron beam welding, and put the slabs after surface cleaning into the vacuum chamber immediately, and carry out welding around the joint surface of the two slabs under vacuum conditions. The welding is closed, and the vacuum state in the middle layer of the two slabs is maintained. [0003] The traditional welding method can also seal the surroundings of the slabs, but it is difficult to maintain the vacuum state at the joint surface of the two slabs. Since the traditional welding method is exposed to the air, the heat input during the welding process will also heat the slab. When the slab has a certain te...

Claims

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Application Information

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IPC IPC(8): B23K31/02
CPCB23K31/02B23K2101/18
Inventor 袁向前焦四海张爱文鲁志政白岩王治宇
Owner BAOSHAN IRON & STEEL CO LTD
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