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Welding method for backing ring trunnion of large converter

A large-scale converter, welding method technology, applied in welding equipment, welding equipment, auxiliary welding equipment and other directions, can solve the problems of heavy workload, difficult to meet technical requirements, and high manufacturing costs

Inactive Publication Date: 2005-08-24
SHANGHAI HEAVY MACHINERY PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the 120-ton or 150-ton large-scale converter trunnions with a total length of more than 11 meters require a large tempering furnace for heat treatment, which requires large equipment investment and high manufacturing costs. Forming is difficult, the workload is heavy, and it is difficult to meet the technical requirements

Method used

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  • Welding method for backing ring trunnion of large converter
  • Welding method for backing ring trunnion of large converter
  • Welding method for backing ring trunnion of large converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、 Embodiment 2

[0015] see image 3 , Figure 4 , Figure 5 , using tube-sheet electroslag welding to weld the test plate, the parameters of the test plate are as follows:

[0016] The material of the test plate is two pairs of Q235-A (equivalent to SM400B);

Embodiment 1

[0017] Embodiment 1: c=150mm, l=300mm, d=600mm;

Embodiment 2

[0018] Embodiment 2: c '=210mm, l=300mm, d=600mm;

[0019] Welding material: H10Mn2AΦ5mm, the pipe is 20# seamless steel pipe Φ14×3.

[0020] The main welding specification parameters are shown in Table 1:

[0021] Example

Welding thickness

(mm)

Number of tubes

(root)

Assembly clearance

(mm)

welding speed

(m / h)

Wire speed

(m / h)

welding voltage

V

Depth of slag pool

(mm)

1

150

3

on 32、

Under 28

0.6～0.8

160～180

46～50

30～40

2

210

4

on 36、

Under 30

0.8～1.0

160～180

46～50

30～40

[0022] There are special requirements for 20# seamless steel pipe, which is coated with special paint on the outer layer. The thickness of the paint is 1-2mm. The main components of the paint are shown in Table 2

[0023] ingredients

Manganese ore p...

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Abstract

A method for welding the trunnion of backing ring for large converter features the tubular-electrode electroslag welding with 3-4 tubular electrodes are used, and the dehydrogenation plus tempering is used for its post-heat-treatment. Its advantages are high efficiency and low temp of heat treating.

Description

(1) Technical field [0001] The invention relates to a large-scale converter in the metallurgical industry, in particular to a welding method for a large-scale converter support ring trunnion. (2) Background technology [0002] Large-scale converters are important equipment in the steelmaking industry, especially large-scale oxygen converters with a capacity of more than 100 tons, and the diameter of the supporting ring of the converter is more than 8 meters. For a converter over 120 tons, the diameter of the converter support ring is 9 meters, plus the length of the two trunnions, the total length exceeds 11 meters, the thickness of the trunnions and ribs is greater than or equal to 210 mm, and the length of the weld exceeds 3 Meter. The existing welding methods are manual welding, gas shielded welding and plate electroslag welding. Plate electroslag welding is applied to large thickness welding, but the grains of the weld seam after plate electroslag welding are coarse and...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K25/00B23K37/00
Inventor 浦跃奋薛宝生张晓明
Owner SHANGHAI HEAVY MACHINERY PLANT
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