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Welding methods for dissimilar metals

A technology of dissimilar metals and welding methods, used in welding equipment, metal processing equipment, welding/welding/cutting items, etc. The effect of smooth and bright, improved welding strength and improved welding quality

Active Publication Date: 2016-03-02
佛山晓世科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of the welded pipe fittings looks beautiful, but the strength of the weld is average
If iron pipes are used for welding at a similar temperature, the copper pipes will be over-burned and dirty, and the copper and iron pipes cannot be welded.
[0005] Moreover, on the one hand, during flash welding, the thermal conductivity of copper and iron has a relationship of about 5 times, while during flash welding, due to the separation and approach of copper and iron pipes, the temperature at the end of the copper pipe fluctuates greatly. It is not easy to form a stable liquid metal layer on the end face of the copper pipe section, and it is also difficult to maintain a stable flashing process; on the other hand, when the end face of the copper pipe section reaches its melting point, it softens rapidly and in large sections, and it is necessary to increase the upsetting process. speed
Such a result will produce two disadvantages, one is the variability of the pipeline, and the other is the need to clamp the copper and iron pipes to implement the upsetting force. The clamping force is easy to pinch the surface of the copper and iron pipes, making it necessary to correct the surface after welding. Handling of pinch marks

Method used

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  • Welding methods for dissimilar metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 As shown, in this embodiment, the copper plate 1 and the iron plate 2 are butt welded by argon arc welding, and the thickness of the two plates is the same.

[0043] Preheat the iron plate 2 to 500±50°C before welding, so that Q’ 高熔点金属 -△Q is equal to 0.90Q’ 低熔点金属 ~1.1Q' 低熔点金属 . The edges of the copper plate 1 and the iron plate 2 are butted in contact to form a weld 3 , which does not need solder. When the edges of the copper plate 1 and the iron plate 2 are butted, apply a force F in opposite directions on the other side of the copper plate 1 and the other side of the iron plate 2, so that the edges of the copper plate 1 and the iron plate 2 are welded during the entire welding process. Stay in touch. Then determine the relative position of welding seam 3 and welding torch nozzle 4, heat can be evenly distributed to copper plate 1 and iron plate 2 in this embodiment, the heating equipment that adopts is a single welding torch, welding torch nozzl...

Embodiment 2

[0045] Such as figure 2 As shown, in this embodiment, the copper plate 1 and the iron plate 2 are butt welded by argon arc welding, and the thickness of the two plates is the same.

[0046] Preheat the iron plate 2 to 300±50°C before welding, so that Q’ 高熔点金属 -△Q greater than 1.1Q’ 低熔点金属 . The edges of the copper plate 1 and the iron plate 2 are butt-contacted to form a weld 3 , and no solder is needed for the weld 3 . When the edges of the copper plate 1 and the iron plate 2 are butted, apply a force F in opposite directions on the other side of the copper plate 1 and the other side of the iron plate 2, so that the edges of the copper plate 1 and the iron plate 2 are welded during the entire welding process. Stay in touch. Then determine the relative position of welding seam 3 and welding torch nozzle 4, the heating equipment that adopts in the present embodiment is double welding torch, wherein the corresponding processing copper plate 1 of welding torch nozzle 4 that o...

Embodiment 3

[0048] Such as image 3 As shown, in this embodiment, the copper plate 1 and the iron plate 2 are lap welded by argon arc welding, and the thickness of the two plates is the same.

[0049] Preheat the iron plate 2 to 300±50°C before welding, so that Q’ 高熔点金属 -△Q greater than 1.1Q’ 低熔点金属 . The edges of the copper plate 1 and the iron plate 2 are overlapped to form a welding seam 3 in overlapping contact, and the welding seam 3 does not need solder. Then determine the relative position of welding seam 3 and welding torch nozzle 4, the heat supply equipment that adopts in the present embodiment is single welding torch, welding torch nozzle 4 points to welding seam 3 and the heating zone shifts toward iron plate 2 direction, makes iron plate 2 or get The heat is about 1.2 times the heat obtained by the copper plate 1, and the angle between the central axis of the welding torch nozzle 4 and the overlapping plane is 45°, so that when welding, the position of the iron plate 2 near...

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Abstract

The invention relates to a welding method for dissimilar metal. Argon arc welding or plasma welding or quasi-ion welding or laser welding or high frequency welding is adopted for autogenous welding, the weight of the portion, needing fusion, of the dissimilar metal is controlled and / or pre-heating is carried out before welding, heat distribution of all portions is stably controlled in the welding process, and therefore the dissimilar metal to be welded can reach the fusion temperature synchronously to the greatest extent, good self-fusion is achieved, and welding flux is not needed. Meanwhile, the welding quality is improved, the welding opening is smooth and polished, and the welding strength is higher than that of traditional flame welding by more than 1.5 times.

Description

technical field [0001] The present invention relates to the field of welding. Background technique [0002] In the field of welding, metal welding is very common. After years of development, the welding process has basically matured. For dissimilar metals, it is generally necessary to use solder, which is due to the difference in physical properties of the dissimilar metals themselves. For example, copper and iron, the melting point of copper is about 1000°C, and the melting point of iron is about 1500°C. Therefore, the current copper-iron welding is generally by silver solder flame brazing. When flame brazing is used, the silver solder is heated and melted by the flame to fill the gap between the copper plate and the iron plate, so that the copper plate and the iron plate are welded together by the solder filled in the gap. When soldering, the soldering temperature is higher than the melting temperature of the solder, but lower than the melting temperature of copper and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/00B23K103/18
CPCB23K31/02B23K2103/18
Inventor 孙建康
Owner 佛山晓世科技服务有限公司
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