High-grade pipeline steel laser welding method

Abstract

The invention discloses a high-grade pipeline steel laser welding method and belongs to the technical field of advanced manufacturing. The method comprises the following steps of welding mode selection, groove machining, equipment parameter setting, welding robot welding programing, pre-welding preparation and laser welding. The high-grade pipeline steel laser welding method is quite suitable for one-step forming of long and straight welding seams of medium-thick material and backing weld of large-pipeline-diameter large-wall-thickness pipelines, and has the advantages of high laser energy density, high welding speed, low heat input, small deformation, high welding efficiency and the like.

Description

technical field

[0001] The invention belongs to the field of advanced manufacturing technology and relates to a laser welding method for high-grade pipeline steel. Background technique

[0002] With the rapid development of oil and gas pipeline construction, pipeline steel continues to develop in the direction of high steel grade, high strength and toughness, high pressure, large pipe diameter and large wall thickness, in order to reduce the cost of pipeline construction and improve the efficiency and safety of oil and gas transmission. Welding is the key and core technology of long-distance pipeline construction. At present, arc welding technologies such as electrode arc welding (SMAW), gas metal arc welding (GMAW) and submerged arc welding (SAW) are mainly used.

[0003] Due to the limitation of arc welding energy density and penetration ability, in the welding of large diameter and large wall thickness pipeline steel, the main methods are to increase heat input and multi-...

Examples

Embodiment 1

[0036] In this example, the weldment is taken from φ1219×18.4mm X80 pipeline steel pipe, and its chemical composition (Wt%) is: C 0.079%, Mn 1.50%, P 0.023%, S 0.007%, Si 0.274%, Nb 0.019%, V 0.016%, Ti0.015%, N 0.002%, Cr 0.067%, Mo 0.324%, Ni 0.131%, the weldment size is 150×50×18.4mm.

[0037] Welding method selection, the wall thickness of the weldment is 18.4mm greater than 15mm, and the pipe diameter is 1219mm greater than 1000mm, and the welding method of single-sided welding and double-sided forming is selected.

[0038] Groove processing, using mechanical processing such as Figure 5a For the groove shown, the thickness of the blunt edge of the groove is 8mm, the shape of the groove is Y-shaped, and the angle of the groove is 20°.

[0039] Equipment parameter setting and robot welding programming. In this embodiment, the welding platform adopts a 10,000-watt-level disc laser, a high-power laser head, a high-precision six-axis mechanical arm, a two-axis positioner, an...

Embodiment 2

[0045]In this example, the weldment is taken from φ1219×12.8mm X100 pipeline steel, and its chemical composition (Wt%) is: C0.064, Mn 1.87%, P 0.009%, Si 0.099%, Nb 0.017%, V 0.002 %, Ti 0.017%, N0.003%, Cr 0.023%, Mo 0.23%, Ni 0.47%, and the weldment size is 150×50×12.8mm.

[0046] Welding method selection, the wall thickness of the weldment is 12.8mm between 8 and 15mm, the pipe diameter is 1219mm greater than 1000mm, and the welding method of double-sided welding is selected.

[0047] Groove processing, using mechanical processing such as Figure 5b The groove shown, the shape of the groove is I type, and the gap is 0-0.2mm.

[0048] Equipment parameter setting and robot welding programming, the welding platform in this embodiment is the same as the welding platform in Example 1, wherein the defocus amount is -5 ~ -4mm, the shielding gas is high-purity argon, and the gas flow rate is 25L / min , Front welding: laser power 8kW, welding speed 0.035m / min; back welding: laser p...

technical field

[0001] The invention belongs to the field of advanced manufacturing technology and relates to a laser welding method for high-grade pipeline steel. Background technique

[0002] With the rapid development of oil and gas pipeline construction, pipeline steel continues to develop in the direction of high steel grade, high strength and toughness, high pressure, large pipe diameter and large wall thickness, in order to reduce the cost of pipeline construction and improve the efficiency and safety of oil and gas transmission. Welding is the key and core technology of long-distance pipeline construction. At present, arc welding technologies such as electrode arc welding (SMAW), gas metal arc welding (GMAW) and submerged arc welding (SAW) are mainly used.

[0003] Due to the limitation of arc welding energy density and penetration ability, in the welding of large diameter and large wall thickness pipeline steel, the main methods are to increase heat input and multi-...

Examples

Embodiment 1

[0036] In this example, the weldment is taken from φ1219×18.4mm X80 pipeline steel pipe, and its chemical composition (Wt%) is: C 0.079%, Mn 1.50%, P 0.023%, S 0.007%, Si 0.274%, Nb 0.019%, V 0.016%, Ti0.015%, N 0.002%, Cr 0.067%, Mo 0.324%, Ni 0.131%, the weldment size is 150×50×18.4mm.

[0037] Welding method selection, the wall thickness of the weldment is 18.4mm greater than 15mm, and the pipe diameter is 1219mm greater than 1000mm, and the welding method of single-sided welding and double-sided forming is selected.

[0038] Groove processing, using mechanical processing such as Figure 5a For the groove shown, the thickness of the blunt edge of the groove is 8mm, the shape of the groove is Y-shaped, and the angle of the groove is 20°.

[0039] Equipment parameter setting and robot welding programming. In this embodiment, the welding platform adopts a 10,000-watt-level disc laser, a high-power laser head, a high-precision six-axis mechanical arm, a two-axis positioner, an...

Embodiment 2

[0045]In this example, the weldment is taken from φ1219×12.8mm X100 pipeline steel, and its chemical composition (Wt%) is: C0.064, Mn 1.87%, P 0.009%, Si 0.099%, Nb 0.017%, V 0.002 %, Ti 0.017%, N0.003%, Cr 0.023%, Mo 0.23%, Ni 0.47%, and the weldment size is 150×50×12.8mm.

[0046] Welding method selection, the wall thickness of the weldment is 12.8mm between 8 and 15mm, the pipe diameter is 1219mm greater than 1000mm, and the welding method of double-sided welding is selected.

[0047] Groove processing, using mechanical processing such as Figure 5b The groove shown, the shape of the groove is I type, and the gap is 0-0.2mm.

[0048] Equipment parameter setting and robot welding programming, the welding platform in this embodiment is the same as the welding platform in Example 1, wherein the defocus amount is -5 ~ -4mm, the shielding gas is high-purity argon, and the gas flow rate is 25L / min , Front welding: laser power 8kW, welding speed 0.035m / min; back welding: laser p...

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