One-step forming straight welding method for stainless steel outer composite tubes

A technology of stainless steel and composite pipes, applied in welding equipment, welding/welding/cutting articles, tubular articles, etc., can solve the problems of high welding cost, labor and time-consuming, easy to rust, etc., and achieve simple welding method, less consumption, low cost effect

Active Publication Date: 2014-01-29
云南昆钢新型复合材料开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the straight seam welding technology of stainless steel outer composite pipe is very demanding. During the welding process, it is necessary to prevent the dilution ratio of chromium and nickel in the weld seam from being too large, which will cause the corrosion resistance of the weld seam to decrease.
The existing welding needs at least two times of welding to complete, which is not only labor-intensive and time-consuming, but also increases the amount of welding rod and flux, and the welding cost is high. more difficult
Although high-frequency welding is used to complete one welding, the corrosion resistance of welding is poor and it is easy to rust, which directly affects the application of stainless steel outer composite pipes.

Method used

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  • One-step forming straight welding method for stainless steel outer composite tubes
  • One-step forming straight welding method for stainless steel outer composite tubes
  • One-step forming straight welding method for stainless steel outer composite tubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weld the 3mm thick stainless steel composite round tube blank with the grade of SUS304+Q235, in which the thickness of the carbon steel base layer is 2.7mm, and the thickness of the outer stainless steel cladding layer is 0.3mm. The chemical composition of the stainless steel cladding layer is shown in Table 1; the selected diameter is Φ1.0mm CHW-308 stainless steel welding wire, the chemical composition of the welding wire is shown in Table 2, the flux is CHF260, and the chemical composition of the flux is shown in Table 3;

[0015] And under the following conditions: the groove gap of the tube blank is 0.8-1.5 mm, the distance from the welding torch contact tip to the tube is 13-23 mm, the distance from the welding wire to the tube is 1.0-2.0 mm, the welding current is 300A, and the welding voltage is 35V , the welding speed is 1.1m / min, the welding wire feeding speed is 15 m / min, and the groove of the tube blank is welded once, such as figure 1 , figure 2 , The wel...

Embodiment 2

[0017] Weld the 5mm-thick stainless steel composite square tube billet of SUS304+Q235, in which the thickness of the carbon steel base layer is 4.5mm, and the thickness of the outer stainless steel layer is 0.5mm. The chemical composition of the stainless steel layer is shown in Table 1; the selected diameter is Φ1.0mm CHW-308 stainless steel welding wire, the chemical composition of the welding wire is shown in Table 2, the flux is CHF260, and the chemical composition of the flux is shown in Table 3;

[0018] And under the following conditions: the groove gap of the tube blank is 0.8-1.5 mm, the distance from the welding torch tip to the tube is 13-23 mm, the distance from the welding wire to the tube is 1.0-2.0 mm, the welding current is 330A, and the welding voltage is 45V , the welding speed is 1m / min, the welding wire feeding speed is 25 m / min, and the groove of the tube blank is welded once, such as image 3 , Figure 4 , The weld has passed the 170-hour salt spray test...

Embodiment 3

[0020] Weld the 7mm thick stainless steel composite round tube billet of grade SUS304+Q235, in which the thickness of the carbon steel base layer is 6.3mm, and the thickness of the outer stainless steel cladding layer is 0.7mm. The chemical composition of the stainless steel cladding layer is shown in Table 1; the selected diameter is Φ1.6mm CHW-308L stainless steel welding wire, the chemical composition of the welding wire is shown in Table 4; the flux is CHF260, and the chemical composition of the flux is shown in Table 3;

[0021] And under the following conditions: the groove gap of the tube blank is 0.8-1.5 mm, the distance from the welding torch contact tip to the tube is 13-23 mm, the distance from the welding wire to the tube is 1.5-2.5 mm, the welding current is 330A, and the welding voltage is 47V , the welding speed is 0.9 m / min, the welding wire feeding speed is 30 m / min, and the groove of the tube blank is welded once, such as figure 1 , figure 2 , The weld has ...

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Abstract

The invention provides a one-step forming straight welding method for stainless steel outer composite tubes. The method is characterized in that one-step welding is performed on shaped bevels of tube blanks, with welding wires having higher nickel and chromium content than stainless steel composite layers and solder having higher nickel and chromium content than the stainless steel composite layers, under the conditions: 0.5-2.5mm spacing of shaped bevels of the tube blanks, 13-23mm spacing H between a welding torch contact nozzle and a tube, 1.0-2.0mm distance h between the welding wires and the tube, 200-350A welding current, 20-50V welding voltage, 0.5-1.5m / min welding speed, and 10-30m / min feeding speed of welding wires. Finished welds of the stainless steel outer composite tubes are subjected to salt spray test for 125 hours, and the test results show no rust; the method is simpler than the existing methods, available for one-step forming, fewer welding wires and solder are used, and the cost is low.

Description

technical field [0001] The invention relates to a welding method, in particular to a method for forming and welding a straight seam of a thin-gauge (wall thickness ≤ 7mm) stainless steel outer composite pipe at one time, and belongs to the field of welding technology. technical background [0002] Stainless steel composite materials are generally made of carbon steel base material and stainless steel cladding material through hot rolling composite method or explosive composite method. It has the strength and processability of carbon steel base materials, and at the same time has the decorative and anti-corrosion properties of stainless steel materials. Stainless steel composite materials can be used in various industries instead of expensive and rare chromium and nickel metal materials. As energy-saving and environmentally friendly materials, they are increasingly favored by people. Composite structural pipes made of stainless steel composite materials have the structural s...

Claims

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Application Information

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IPC IPC(8): B23K9/025B23K33/00
CPCB23K9/0253B23K33/004B23K33/006B23K2101/06B23K2103/04
Inventor 尹正培张跃董兆祥王云春李俊兴武邵权曲伟杜顺林姜庆伟王庭昆
Owner 云南昆钢新型复合材料开发有限公司
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