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Welding method of aluminum steel plate for ship, coating preparation method and aluminum steel plate

A welding method and technology for aluminum steel plates, applied in welding equipment, anti-corrosion coatings, coatings, etc., can solve the problems that the strength of the weld is not easy to reach the strength of the base metal, the grain coarsening, the peeling of the weld and the base metal, etc. Joint strength and creep properties, good mechanical properties, improved effect of temperature gradients

Active Publication Date: 2018-04-10
杭州钱航船舶修造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature reaches the melting point of the metal with a high melting point and the metal with a high melting point is in a molten state, the metal with a low melting point will inevitably be lost due to excessive temperature, and the metal alloy elements with a low melting point will evaporate or burn, making it difficult to weld the weld. form
[0004] (2) The greater the difference in linear expansion coefficient between dissimilar metals, the more difficult it is to weld
The metal material with a large linear expansion coefficient has a large amount of thermal expansion and a large amount of shrinkage when cooling, so a large internal stress will be generated during the crystallization process of the molten pool. Due to the different stress states of the metal materials on both sides of the weld, it is easy to make Cracks in the weld seam and the heat-affected zone may even cause the weld seam to peel off from the base metal
[0005] (3) The greater the difference in specific heat capacity and thermal conductivity between dissimilar metals, the more difficult it is to weld, and it is easy to deteriorate the crystallization conditions of the weld, the phenomenon of grain coarsening is serious, and greatly affects the wettability of refractory metals
[0006] (4) When arc welding is used, the greater the electromagnetic difference between dissimilar metals, the more difficult it is to weld, the more unstable the arc in the welding process, and the weld formation is easy to deteriorate
[0007] (5) The stronger the activity of dissimilar metals, the more difficult it is to weld
Intermetallic compounds are hard and brittle, prone to cracks in welds, and may even cause brittle fracture
[0009] (7) The weld strength obtained by welding dissimilar metals is not easy to reach the strength of the base metal
The latter will lead to a metallurgical reaction between the two to form FeAl 3 , Fe 2 Al, Fe 2 Al 7 , Fe 2 Al 5 、FeAl 2 Such as Fe-Al intermetallic compounds, reduce the plasticity and toughness of joints, and even cause welding cracks

Method used

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  • Welding method of aluminum steel plate for ship, coating preparation method and aluminum steel plate
  • Welding method of aluminum steel plate for ship, coating preparation method and aluminum steel plate

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: The welding groove of the above-mentioned 5754 aluminum plate and the AH36 steel plate is processed into a V-shaped groove, and the groove angle is 60°. The groove and both sides of the inner and outer walls are cleaned until the metallic luster is exposed; The paint is applied on the mouth, the paint is applied twice, and the thickness of each coating is 25-30um, and the first paint needs to be heated after the first paint is dried, and the second paint is heated to 55-60°C. Secondary paint coating; preheat the weldment after the paint is dry, and the preheating temperature is 150-200°C; use laser filler wire for brazing welding, and the welding wire is aluminum-silicon welding wire with a silicon content of 6% of the model ER4043 , the wire feeding is carried out in the way of front wire feeding, the wire feeding angle is 30°, the wire feeding speed is 2.4m / min, the welding speed is 12mm / s, the laser power is 2500W, the protective gas is helium, and after...

Embodiment 2

[0031] Embodiment 2: The welding groove of the above-mentioned 5754 aluminum plate and the AH36 steel plate is processed into a V-shaped groove, and the groove angle is 60°. The groove and both sides of the inner and outer walls are cleaned until the metallic luster is exposed; The paint is applied on the mouth, the paint is applied twice, and the thickness of each coating is 25-30um, and the first paint needs to be heated after the first paint is dried, and the second paint is heated to 55-60°C. Secondary paint coating; preheat the weldment after the paint is dry, and the preheating temperature is 150-200°C; use laser filler wire for brazing welding, and the welding wire is aluminum-silicon welding wire with a silicon content of 6% of the model ER4043 , using the front wire feeding method for wire feeding, the wire feeding angle is 25°, the wire feeding speed is 2.6m / min, the welding speed is 11.5mm / s, the laser power is 2550W, the protective gas is helium, and the welding is ...

Embodiment 3

[0032] Embodiment 3: The welding groove of the above-mentioned 5754 aluminum plate and the AH36 steel plate is processed into a V-shaped groove, and the groove angle is 60°. The groove and both sides of the inner and outer walls are cleaned until the metallic luster is exposed; The paint is applied on the mouth, the paint is applied twice, and the thickness of each coating is 25-30um, and the first paint needs to be heated after the first paint is dried, and the second paint is heated to 55-60°C. Secondary paint coating; preheat the weldment after the paint is dry, and the preheating temperature is 150-200°C; use laser filler wire for brazing welding, and the welding wire is aluminum-silicon welding wire with a silicon content of 6% of the model ER4043 , using the front wire feeding method for wire feeding, the wire feeding angle is 35°, the wire feeding speed is 2.8m / min, the welding speed is 12.5mm / s, the laser power is 2650W, the shielding gas is helium, and it is heated to ...

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Abstract

The invention discloses a method for welding an aluminum and steel plate for ships.The method includes a), machining weld grooves to obtain V-shaped grooves with groove angles of 60 degrees, and cleaning the grooves and two sides of the inner wall and two sides of the outer wall of each groove until metallic luster is exposed; b), coating the grooves with paint; c), drying the paint and then preheating weld components at the preheating temperature of 150-200 DEG C; d), welding the aluminum and steel plate by the aid of laser filler wires; e), annealing the aluminum and steel plate, to be more specific, heating the aluminum and steel plate until the temperature of the aluminum and steel plate reaches 440 DEG C, preserving heat of the aluminum and steel plate for 12-14 h and cooling the aluminum and steel plate by the aid of air.The thickness of the paint spread on the grooves is 50-60 micrometers, the paint comprises, by weight, 12 parts of polyvinyl butyral, 3 parts of aluminum powder, 2 parts of ceramic powder, 25 parts of dimethylbenzene, 7 parts of diethyl ether, 11 parts of copper and zinc alloy powder and 30 parts of triphenylmethanol, and a weight ratio of copper to zinc in the copper and zinc alloy powder is 6:5.The method has the advantage that welded joints are excellent in mechanical performance after the aluminum and steel plate is welded.

Description

technical field [0001] The invention relates to the field of dissimilar metal welding, in particular to a welding method of aluminum steel plates for ships, a coating preparation method and the aluminum steel plates. Background technique [0002] The welding of dissimilar metals refers to the process of welding two or more different metals under certain processing conditions. Welding between dissimilar metals is much more complicated than welding of same metals. The weldability of dissimilar metals refers to the adaptability of two or more metals with different components, different structures, and different properties to welding and the ability to operate safely, effectively and reliably after welding. It refers to the difficulty of obtaining high-quality and reliable welded joints between dissimilar metals under certain welding process conditions. The weldability of dissimilar metals is first of all joint performance, that is, the ability of dissimilar metal materials to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D129/14C09D7/61C09D5/10B23K1/005B23K1/20
CPCB23K1/0056B23K1/20B23K2103/20C08K3/08C08K5/06C08K13/02C08K2003/0812C08K2003/085C08K2003/0893C09D5/103C09D7/61C09D7/63C09D129/14
Inventor 罗洋
Owner 杭州钱航船舶修造有限公司