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Brass fitting laser welding method

A brass fittings, laser welding technology, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve problems such as increasing processing difficulty and increasing processes, and achieve beautifying the appearance of welds, improving production efficiency, and good performance. Effect

Active Publication Date: 2018-08-17
WUHAN HGLASER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method increases the processing difficulty in the brass workpiece manufacturing process and increases the working procedure.

Method used

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  • Brass fitting laser welding method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as Figure 1-Figure 3 , an embodiment of the present invention provides a laser welding method for brass fittings, including:

[0033] Step 1, cleaning the surfaces to be welded of the two brass weldments 1;

[0034] Step 2, positioning two brass weldments 1;

[0035] Step 3: Carry out laser rooting welding, wherein the spot diameter at the focal point is 0.2-0.5mm, the laser power is 600-1500W, the welding speed is 6-15mm / s, the defocus amount is -3-+3mm, and the gas shielded welding method is adopted;

[0036] Step 4: Carry out laser capping welding, wherein the spot diameter at the focal point is 0.2-0.5mm, the laser power is 600-1500W, the welding speed is 6-15mm / s, the defocus amount is +4-+15mm, and the gas shielded welding method is adopted.

[0037] In this embodiment, laser welding of brass fittings is realized by combining laser bottom welding and laser cover welding. Through reasonable selection of process parameters in the two welding processes, welds...

Embodiment 2

[0049] Such as figure 2 , the brass fittings are valves used to control fluid flow, and the sum of the penetration depths of laser bottom welding and laser cap welding is controlled to be 1.8-2.5mm, and more preferably controlled at 2mm. Correspondingly,

[0050] In step 3, the diameter of the spot at the focus of the laser beam 2 is 0.3mm, the laser power is 780-850W, the welding speed is 9-12mm / s, and the defocus is 0, that is, the focus of the laser beam 2 is located on the surface of the two brass weldments 1 ; Wherein, as a preferred embodiment, the laser power is 800W, the welding speed is 10mm / s, and the laser power adopts a slow-rising and slow-falling control mode;

[0051] In step 4, the diameter of the spot at the focal point is 0.3mm, the laser power is 780-850W, the welding speed is 9-12mm / s, and the defocus is +6-+8mm; among them, as a preferred embodiment, the laser power is 800W, The welding speed is 10mm / s, the defocus is +7mm, and the laser power is control...

Embodiment 3

[0057] Such as image 3 , the brass accessories are refrigeration accessories, and the refrigeration accessories include air-conditioning refrigeration check valves, charging valves, liquid filling valves or needle valves. 1.2mm, further preferably controlled at 1mm, correspondingly,

[0058] In step 3, the diameter of the spot at the focal point of the laser beam 2 is 0.2mm, the laser power is 600-650W, the welding speed is 7-8mm / s, and the defocus is +2-+3mm; among them, as a preferred embodiment, the laser The power is 600W, the welding speed is 8mm / s, the defocus is +3mm, and the laser power adopts a slow-rising and slow-falling control method;

[0059] In step 4, the diameter of the spot at the focal point is 0.2mm, the laser power is 600-650W, the welding speed is 9-10mm / s, and the defocus is +5-+6mm; among them, as a preferred embodiment, the laser power is 600W, The welding speed is 10mm / s, the defocus amount is +5mm, and the laser power adopts a slow-rising and slow...

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Abstract

The invention relates to a brass fitting laser welding method. The brass fitting laser welding method comprises the following steps that 1, to-be-welded surfaces of two brass fittings are cleaned; 2,the two brass fittings are positioning; 3, laser backing welding is carried out, the diameter of a light spot at a focal point is 0.2-0.5 mm, the laser power is 600-1500 W, the welding speed is 6-15 mm / s, the defocusing amount is -3 mm to +3 mm, and a gas shielded welding mode is adopted; and 4, laser cover surface welding is carried out, the diameter of the light spot at the focal point is 0.2-0.5 mm, the laser power is 600-1500 W, the welding speed is 6-15 mm / s, the defocusing amount is +4 mm to +15 mm, and the gas shielded welding mode is adopted. According to the brass fitting laser welding method, the laser backing welding and the laser cover surface welding are combined together to achieve the laser welding of the brass fittings, through reasonable selection of technological parameters of two welding procedures, a weld joint with the good performance and the attractive appearance can be obtained, the complex procedures in the brass fitting welding manufacturing process can be simplified, and the production efficiency of brass tube welding can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of processing brass fittings, and in particular relates to a laser welding method for brass fittings. Background technique [0002] Brass is a copper-zinc alloy. Due to the low boiling point of zinc, which is only 907°C, it is very easy to evaporate during the welding process, which has become the biggest problem in brass welding. Under the high temperature of welding, the evaporation of zinc in traditional electrode arc welding is as high as 40%. The large amount of evaporation of zinc leads to the decline of mechanical properties and corrosion resistance of welded joints, and also increases the sensitivity to stress corrosion. The evaporated zinc is immediately oxidized into zinc oxide in the air, forming white smoke, which brings great difficulties to the operation and affects the health of welders. Brass has poor weldability, and problems such as pores, cracks, evaporation and oxidation of zinc may occu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/28B23K26/60B23K26/12
CPCB23K26/123B23K26/28B23K26/60
Inventor 李翠祁小勇叶兵余世文喻亮王爱华卢飞星
Owner WUHAN HGLASER ENG CO LTD
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