Copper and steel bimetal bridging welding method

A welding method and bimetallic technology, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of poor air tightness of workpieces, low tensile strength of joints, high requirements for welding personnel, etc., and achieve good welding , easy to standardize operation, combined with tight effect

Inactive Publication Date: 2014-04-30

NORTHEASTERN UNIV

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AI-Extracted Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a copper-steel bimetallic bridging welding method, which changes the traditional direct welding method of steel/copper dissimilar metals by utilizing the "bridge" welding of two materials of steel and copper...

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Abstract

The invention belongs to the technical field of metal welding, and particularly relates to a copper and steel bimetal bridging welding method. The method includes firstly adding copper material and charcoal into a steel drum, then placing the steel drum in a heating furnace to form flux inside, placing the steel drum with the flux into a centrifuge, turning on the centrifuge to rotate in the speed of 400 to 800 rpm, allowing the flux to cool till solidifying as copper alloy, allowing the middle of the copper alloy to form a sump, obtaining a bimetal drum, then placing the bimetal drum into casting sand to cool till room temperature, obtaining a bimetal combined drum, rolling, extruding, tensioning, forging and cutting the bimetal combined drum, obtaining a steel and copper welding bridge, welding steel to be welded to the steel side of the welding bridge, welding copper to be welded to the copper side of the welding bridge, and finishing steel and copper welding. According to the technical scheme, the atomically-bound copper and steel bimetal serves as a bridge, copper and copper, steel and steel can be welded easily, and copper and steel bimetal welding can be realized.

Application Domain

Welding/soldering/cutting articlesWelding apparatus

Technology Topic

Heating furnaceMetal +9

Image

Examples

Experimental program(4)

Example Embodiment

[0023] Example 1

[0024] In this embodiment, 304 stainless steel and aluminum bronze are bridged and welded. The specific steps are:

[0025] (1) Pickling the 304 stainless steel barrel and removing oil stains on the surface, prepare aluminum bronze material with the same composition as the aluminum bronze to be welded, cut into blocks, prepare charcoal that accounts for 0.5% of the total weight of aluminum bronze;

[0026] (2) The aluminum bronze material and charcoal are mixed and put into a steel drum. The total volume of aluminum bronze and charcoal is 20% of the total volume of the inner space of the steel drum. The one with a circular hole in the center is the same as the stainless steel to be welded. The stainless steel cover is welded and fixed on the 304 stainless steel barrel, the round hole is connected to the inside of the 304 stainless steel barrel, and then the steel barrel is placed in a heating furnace, heated to 1050°C, kept for 60 minutes, and a melt is formed in the 304 stainless steel barrel;

[0027] (3) Put the 304 stainless steel bucket containing the melt in the centrifuge, turn on the centrifuge and rotate at 400rpm, the melt is gradually cooled until all solidified into a copper alloy, and a liquid cavity is formed in the middle of the copper alloy to form a bimetallic circle. Then put the bimetallic drum into the foundry sand to cool down to room temperature to obtain a bimetallic combined cylinder;

[0028] (4) Rolling, extruding, drawing, forging and cutting the bimetallic tube to obtain the steel-copper welding bridge required for steel-copper welding. The metallographic structure diagram is as follows image 3 Shown from image 3 It can be seen that the connection between steel and copper is tightly combined, which also ensures the mechanical properties of the steel-copper alloy prepared by welding as a welding bridge;

[0029] (5) Such as figure 1 As shown, the steel to be welded and the steel side of the welding bridge, the copper to be welded and the copper side of the welding bridge are respectively welded, and the solder joints are polished. The steel copper welding is completed, and the tensile fracture is often located in the copper and copper welding Therefore, the mechanical properties of the copper-steel bimetal after welding are tested, and the overall tensile strength after welding can reach 380MPa.

[0030] In the above method, the wall thickness of the steel drum is greater than the welding bridge wall thickness by 0.5 mm.

Example Embodiment

[0031] Example 2

[0032] In this embodiment, 20# steel and tin bronze are bridged and welded. The specific steps are:

[0033] (1) Pickling the 20# steel drum and removing oil stains on the surface, prepare tin bronze material with the same composition as the tin bronze to be welded, cut into blocks, prepare charcoal which accounts for 1% of the total weight of tin bronze;

[0034] (2) Put the tin bronze and charcoal into a steel drum after mixing. The total volume of copper and charcoal is 40% of the total volume of the inner space of the steel drum. The 20# steel cover with a round hole in the center is welded and fixed to 20 On the #steel drum, the round hole is connected to the inside of the 20# steel drum, and then the steel drum is placed in a heating furnace, heated to 1200°C for 30 minutes, and a melt is formed in the 20# steel drum;

[0035] (3) Put 20# steel drum with melt in the centrifuge, turn on the centrifuge and rotate at 500rpm, the melt is gradually cooled until all solidified into copper alloy, and a liquid cavity is formed in the middle of the copper alloy to form a bimetal Then put the bimetallic drum into the foundry sand to cool down to room temperature to obtain a bimetallic combined cylinder;

[0036] (4) Rolling, extruding, drawing, forging and cutting the bimetallic tube to obtain the steel-copper welding bridge required for steel-copper welding. The metallographic structure is as follows Figure 4 Shown from Figure 4 It can be seen that the connection between steel and copper is tightly combined, which also ensures the mechanical properties of the steel-copper alloy prepared by welding as a welding bridge;

[0037] (5) Such as figure 2 As shown, the steel to be welded and the steel side of the welding bridge, the copper to be welded and the copper side of the welding bridge are respectively welded, and the solder joints are polished. The steel copper welding is completed, and the tensile fracture is often located in the copper and copper welding Therefore, the mechanical properties of the copper-steel bimetal after welding are tested, and the overall tensile strength after welding can reach 330MPa.

[0038] In the above method, the wall thickness of the steel drum is greater than the welding bridge wall thickness by 1.0 mm.

Example Embodiment

[0039] Example 3

[0040] In this embodiment, 20# steel and brass are bridged and welded. The specific steps are:

[0041] (1) Pickling the 20# steel drum and removing the surface oil stains, prepare the brass material with the same composition as the brass to be welded, cut into blocks, prepare charcoal which accounts for 2% of the total weight of the brass;

[0042] (2) Put the brass material and charcoal into a steel drum after mixing. The total volume of the copper material and charcoal is 60% of the total volume of the inner space of the steel drum. Weld and fix the 20# steel cover with a circular hole in the center. On the 20# steel drum, the round hole is connected to the inside of the 20# steel drum, and then the steel drum is placed in a heating furnace, heated to 1350℃, kept for 10 minutes, and a melt is formed in the 20# steel drum;

[0043] (3) Put the 20# steel drum with the melt in the centrifuge, turn on the centrifuge and rotate at 650rpm, the melt is gradually cooled until all solidified into copper alloy, and a liquid cavity is formed in the middle of the copper alloy to form a bimetal Then put the bimetallic drum into the foundry sand to cool down to room temperature to obtain a bimetallic combined cylinder;

[0044] (4) Rolling, extruding, drawing, forging and cutting the bimetallic tube to obtain the steel-copper welding bridge required for steel-copper welding;

[0045] (5) Such as figure 1 As shown, the steel to be welded and the steel side of the welding bridge, the copper to be welded and the copper side of the welding bridge are respectively welded, and the solder joints are polished. The steel copper welding is completed, and the tensile fracture is often located in the copper and copper welding Therefore, the mechanical properties of the copper-steel bimetal after welding are tested, and the overall tensile strength after welding can reach 250MPa.

[0046] In the above method, the wall thickness of the steel drum is greater than the welding bridge wall thickness by 1.5 mm.

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PUM

Property	Measurement	Unit
Tensile strength	180.0 ~ 380.0	MPa
Tensile strength	380.0	MPa
Tensile strength	330.0	MPa
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Easy to standardize operation
Efficient welding

Copper and steel bimetal bridging welding method

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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