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A terminal heating method for preventing terminal cracks from fcb welding

A heating method and terminal technology, applied in welding equipment, welding accessories, metal processing, etc., can solve problems such as stress release at unfavorable welds, complicated welding production operations, and arching of welded parts, so as to reduce the bending of the plate surface. Arch phenomenon, improve welding quality and reduce welding deformation

Active Publication Date: 2015-10-28
QINGDAO WUCHUAN HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The terminal restraint method of the arc extinguishing plate makes the weld terminal be constrained by the arc extinguishing plate, not only the stress generated during the welding process will be very concentrated, and cracks are easy to occur, but also the terminal restraint method of the arc extinguishing plate needs to be continuously adjusted with the size of the weldment. The width of the arc plate, the process is numerous, and the welding efficiency is low
[0007] To sum up, the terminal root welding method, the terminal oil pressure restraint method, the arc extinguishing plate terminal restraint method or the complex process or the need for supporting equipment with high requirements, the welding production operation is complicated, the welding efficiency is low, and the weld terminal Constrained, it is not conducive to the stress release at the weld, resulting in a large strain of the weldment, and the phenomenon of arching of the weldment plate is more serious

Method used

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  • A terminal heating method for preventing terminal cracks from fcb welding
  • A terminal heating method for preventing terminal cracks from fcb welding
  • A terminal heating method for preventing terminal cracks from fcb welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] This embodiment provides a terminal heating method for preventing FCB welding from producing terminal cracks, comprising the following steps:

[0065] Step 101, install the arc extinguishing plate 2 on the bottom of the welding end of the longitudinal weld 5 formed by the steel plate 1 to be welded, install the arc starting plate 3 on the bottom of the welding start of the longitudinal weld 5, and preset isosceles in the welding end area In the temperature control zone 4 of the triangle, the apex of the isosceles triangle is located on the longitudinal weld 5 and is far away from the arc extinguishing plate 2, the base of the isosceles triangle is perpendicular to the longitudinal weld 5, the height of the isosceles triangle is a, and the length of the base is is 2b; define three yield strength intervals of steel plate 1 to be welded: P1: [235MPa, 275MPa]; P2: (275MPa, 345MPa]; P3: (345MPa, 390MPa]; define four thickness intervals of steel plate 1 to be welded: D1: [10m...

Embodiment 2

[0071] This embodiment provides a terminal heating method for preventing FCB welding from producing terminal cracks, comprising the following steps:

[0072] Step 201, this step is the same as step 101 in Embodiment 1.

[0073] Step 202, the steel plate selected in this embodiment is Q390 steel, the specification is 10000×2000×25 (length×width×thickness), the yield strength p is 390MPa, and the thickness d is 25mm, which conforms to GB712-2011 "For ships and ocean engineering "Structural steel" requirements, that is, p∈P3, d∈D3, see Table 2, preset a=650mm, b=200mm, T=650~700℃; mark temperature control zone 4 according to a and b.

[0074] Step 203, preset the welding speed according to the width of the longitudinal weld 5, measure the welding distance between the welding start of the longitudinal weld 5 and the apex of the isosceles triangle, divide the welding distance by the welding speed, and obtain m1; select a thermocouple as Heating tool, according to the parameters of...

Embodiment 3

[0077] The terminal heating method of embodiment 3 comprises the following steps:

[0078] Step 301, this step is the same as step 101 in Embodiment 1.

[0079] Step 302 , see Table 2 for the yield strength, specifications, heating temperature range, temperature control zone and other parameters of the steel plate in this embodiment, and mark the temperature control zone 4 according to a and b in Table 2.

[0080] Step 303, the heating tools selected in this embodiment are shown in Table 2 for details, m1 and m2 are obtained according to step 103 in embodiment 1, m2 is less than m1, and it is determined to start welding the longitudinal weld 5 first, and then start heating the temperature control zone 4.

[0081] Step 304, first start welding the longitudinal weld 5 by FCB arc welding, then heat the temperature control zone 4, and monitor the surface temperature of the steel plate where the temperature control zone 4 is located by using an infrared thermometer. See Table 3 fo...

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Abstract

The invention discloses a finishing end heating method capable of preventing finishing end cracks from being generated in FCB welding, and relates to the field of material forming and control. The finishing end heating method capable of preventing the finishing end cracks from being generated in the FCB welding comprises the steps that a temperature control area in an isosceles triangle is preset in a welding finishing end area, the vertex of the isosceles triangle is located on a longitudinal welding seam, the bottom side of the isosceles triangle is perpendicular to the longitudinal welding seam, the length of the height of the isosceles triangle is a, and the length of the bottom side of the isosceles triangle is 2b; three yield strength sections and four thickness sections of a steel plate to be welded are defined; the a, the b and a temperature range T of the temperature control area are preset according to the yield strength section where the yield strength p of the steel plate 1 to be welded is located and the thickness section where the thickness d of the steel plate 1 to be welded is located; the temperature control area is heated, the longitudinal welding seam is welded, and the temperature in the temperature control area reaches T when welding is reaches the vertex of the isosceles triangle from the initial welding end of the longitudinal welding seam; heating is stopped, and welding is stopped when welding reaches the welding finishing end of the longitudinal welding seam; cooling is carried out, and a welded steel plate sample is formed. According to the finishing end heating method capable of preventing the finishing end cracks from being generated in the FCB welding, the probability of generating cracks at the finishing end of the welding can be reduced, the phenomenon of arch cambers on a plate surface can be controlled, deformation can be reduced, and the technology can be simplified.

Description

technical field [0001] The invention relates to the field of material forming and control, in particular to a terminal heating method for preventing terminal cracks from FCB welding. Background technique [0002] The FCB (Flux Cuprum Behind, reverse flux and copper pad) welding method is widely used in major shipbuilding heavy industry enterprises. It is a necessary link to form a plane segment assembly line. The ability constitutes a direct impact. At present, when the FCB welding method is used for terminal welding, the terminal restraint method is often used. The terminal restraint method mainly includes three methods: the terminal backing welding method, the terminal oil pressure restraint method, and the arc extinguishing plate terminal restraint method. [0003] The terminal rooting welding method, the terminal oil pressure restraint method, and the arc extinguishing plate terminal restraint method have the following disadvantages: [0004] The terminal backing weldi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/02B23K9/025B23K9/32
CPCB23K9/025B23K9/235B23K2101/185
Inventor 徐雁飞刘海清
Owner QINGDAO WUCHUAN HEAVY IND CO LTD
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