Technique for welding car axle housing made by punching medium heavy steel plates

A welding process and thick steel plate technology, which is applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of easy generation of nitrogen pores, strength reduction, and spatter, so as to ensure welding quality, increase welding strength, and improve bonding intensity effect

Inactive Publication Date: 2003-07-23
重汽(济南)车桥有限公司
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Problems solved by technology

Although this method meets the requirements of melting depth, spatter will be generated during welding, which will affect safety and damage the environment; it will also easily generate nitrogen pores in the weld, which will affect the quality; and because of the large groove angle, the gap to be filled wide, and many times of welding, so the workload is large, time-consuming, and material-consuming; moreover, because the welding tip of the automatic gas shielded welding machine cannot swing, it is always in the center of the weld, and the heat of the molten pool is normally distributed, high temperature The width of the zone is limited, the temperature of the fusion zone on both sides of the weld is obviously lower than that of the weld center, and the strength of the joint between the base metal and the filler wire metal in the fusion zone is significantly reduced, which becomes the weak point in the fatigue life of the automobile axle housing, and fatigue damage is extremely prone to occur , seriously affecting the quality

Method used

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  • Technique for welding car axle housing made by punching medium heavy steel plates
  • Technique for welding car axle housing made by punching medium heavy steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: When performing gas shielded welding on medium-thick steel stamped automobile axle housings, the thickness δ of the steel plate 1 is 12mm, and the butt joint steel plate 1 has a double-sided groove 2 in a Y shape, and the groove angle α is 6°, blunt The side height P is 0mm, the shielding gas is carbon dioxide, and the process parameters are: the diameter of the welding wire is 1.6mm, the welding voltage is 32V, the welding current is 500A, the welding speed is 0.4m / min, the welding tip height is 20mm, and the number of welding times is For one pass, the gas flow rate is 18L / min, the eccentricity is 8mm, the welding power source is DC reverse connection, the welding wire direction is reverse, the welding method is boat welding, and the penetration rate reaches 100%.

Embodiment 2

[0027] Embodiment 2: When performing gas shielded welding, when the thickness δ of the butt steel plate 1 is 20mm, the butt steel plate has a double-sided groove 2 in a Y shape, the groove angle α is 12°, and the shielding gas is argon and carbon dioxide mixed gas. The ratio is 4:1, and its process parameters are: blunt edge height P is 4mm, welding wire diameter is 2.0mm, welding voltage is 36V, welding current is 600A, welding speed is 0.8m / min, welding tip height is 25mm, welding The number of passes is one, the gas flow rate is 25L / min, the welding power supply is DC reversed, the direction of the welding wire is reversed, the welding method is flat welding, the design penetration rate is 66%, and the penetration rate reaches the standard.

Embodiment 3

[0028] Embodiment 3: When performing gas shielded welding, when the thickness δ of the butt steel plate 1 is 16mm, the butt steel plate 1 has a double-sided groove 2 in a Y shape, the groove angle α is 10°, and the shielding gas is carbon dioxide gas. The parameters are: the blunt edge height P is 3mm, the welding wire diameter is 1.6mm, the welding voltage is 34V, the welding current is 550A, the welding speed is 0.5m / min, the welding tip height is 20mm, the number of welding times is two times, and the gas flow rate is 22mL / min, the welding power supply is DC reversed, the direction of the welding wire is reversed, the welding method is boat welding, and the penetration rate reaches 100%.

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Abstract

A technology for welding the punched bridge shell of car includes punching on (12-20)-mm steel plate to form bridge shell, making, Y-shape bevels by 6-20 deg. of angle, fixing by dot welding, and gasprotected welding with consumable electrode. Its advantages are high welding strength and quality, and no splash.

Description

(1) Technical field [0001] The invention relates to a metal gas shielded arc welding technology for stamping automobile axle housings of medium-thick steel plates, and belongs to the technical field of metal welding. (2) Background technology [0002] At present, when medium-thick steel plate stamping automobile axle housing is welded by gas metal arc welding, in order to ensure the depth of fusion, the existing technology has a groove greater than 40°, and adopts conventional parameters. Although this method meets the requirements of melting depth, spatter will be generated during welding, which will affect safety and damage the environment; it will also easily generate nitrogen pores in the weld, which will affect the quality; and because of the large groove angle, the gap to be filled wide, and many times of welding, so the workload is large, time-consuming, and material-consuming; moreover, because the welding tip of the automatic gas shielded welding machine cannot swin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02
Inventor 马殿宝林伟
Owner 重汽(济南)车桥有限公司
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