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Flame brazing control method for copper and aluminum welding and automatic welding machine

A technology of flame brazing and control method, applied in welding/welding/cutting items, welding equipment, manufacturing tools, etc. Improve pass rate, improve welding efficiency, overcome the effect of over-burning or under-burning of aluminum parts or uneven penetration of solder

Active Publication Date: 2022-04-05
DAISHIN XINRUI BRAZING EQUIP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problems existing in the prior art, the technical problem to be solved by the present invention is to provide a flame brazing control method and an automatic welding machine for copper-aluminum welding to overcome over-burning or under-burning of aluminum parts or uneven solder penetration and Defects in the change of crystal phase structure of copper parts, improve welding quality, pass rate, and improve welding efficiency

Method used

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  • Flame brazing control method for copper and aluminum welding and automatic welding machine
  • Flame brazing control method for copper and aluminum welding and automatic welding machine
  • Flame brazing control method for copper and aluminum welding and automatic welding machine

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Experimental program
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Effect test

Embodiment 1

[0037] On the automatic flame brazing machine, the flame of the combustion of natural gas, air and oxygen is used as a heat source, 4 air nozzles, natural gas flow to 7 l / min, and air flow is set to 118L / min, and the oxygen flow is set to 6 L / min. Use an aluminosilicone core welding wire, copper aluminum solder paste. The four air nozzles with suitable spacing were soldered with the aluminum base with the aluminum base with the aluminum base. Preheating copper tube 6 seconds, preheating aluminum base for 14 seconds, free wire welding time for 6 seconds. A total of 26 seconds.

Embodiment 2

[0043] On the automatic flame brazing machine, the flame of natural gas and air and oxygen is mixed into the heat source, and the natural gas flow is set to 3.5 L / min, and the air flow is set to 70 l / min, and the oxygen flow is set to 7 l / min. The pipe diameter 19 mm copper tube is heated to 600 degrees by a 10 mm swing distance from the two air nozzles of 110 mm. Time 11 seconds. Photo of the color change of the copper tube after cooling Figure 4 (b).

Embodiment 3

[0049] On the automatic flame brazing machine, the combustion of the combustion of natural gas, air and oxygen is used as a heat source, 4 air noise, and natural gas flow is set to 7 l / min, and the air flow is set to 140 l / min, and the oxygen flow is 14 L / min. Preheating copper tube 5 seconds, immediately switchable natural gas flow rate of 7 l / min, air flow is 140 l / min, and the oxygen flow is 7 l / min, the preheating aluminum base is 13 seconds, and then immediately switch into natural gas flow rate 7L. / min, air flow 140L / min, mixed gas combustion heating welding area for oxygen flow 5.6 l / min for 5.5 seconds. Use an aluminosilicone core welding wire, copper aluminum solder paste. The tube diameter 19 mm copper tube is brazed with the aluminum tube base with a wobble distance of 10 mm with the same suitable spacing.

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Abstract

The invention discloses a flame brazing control method for copper and aluminum welding. The flame brazing control method is characterized in that flame formed by mixed combustion of natural gas, air and oxygen serves as a heat source. The invention further discloses an automatic welding machine for copper-aluminum welding, which is characterized in that flame formed by mixed combustion of natural gas, air and oxygen is used as a heat source, and the automatic welding machine comprises a natural gas conveying system, an air conveying system and an oxygen conveying system, and a mixer for mixing the natural gas, the air and the oxygen, and the flow controller assembly is used for controlling the electromagnetic valves and the flow valves in the three-way gas conveying system. According to the method, the defects that in copper-aluminum flame brazing, an aluminum piece is over-burnt or under-burnt, or solder permeation is uneven, and a copper piece crystal phase structure changes are overcome, meanwhile, the welding quality, the welding qualification rate and the welding efficiency are improved, and the first-pass yield reaches 99% or above.

Description

Technical field [0001] The present invention relates to the field of automatic flame brazing, and more particularly to flame brazing control methods and automatic welding machines for copper-free welding. Background technique [0002] The density of aluminum is one-third of copper, not only light weight, but also low price. Under the trend of aluminum, the copper-aluminum connection forms a composite structure to play the advantages of copper aluminum, with a wide range of applications, such as heating instruments, air conditioners, refrigeration industries, and the like. Flames are important methods for achieving copper aluminum connection. The flame brazing is a characteristic of the metal solder by the metal solder, which is heated to a solder metal, which is less than the solder, which is smaller than the welding of the solder melting point, the solder melting and metallurgy with the welding metal, soaking through the capillary Part metal is achieved. [0003] In the prior ar...

Claims

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Application Information

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IPC IPC(8): B23K1/00B23K3/00B23K3/08B23K103/18
CPCB23K3/00B23K1/00B23K3/08F23D14/72B23K3/04B23K3/043B23K2103/18B23K2101/06
Inventor 王水庆曹侃梁镪徐康汪锡云娄银斌
Owner DAISHIN XINRUI BRAZING EQUIP
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