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Method for welding 16MnDR low-temperature pressure container pot body closing end splicing welding line

A technology for pressure vessels and stitching welds, which is applied to welding equipment, arc welding equipment, and the edge of workpieces, etc., which can solve problems such as economic losses, difficulties in meeting use requirements, and increased production costs

Active Publication Date: 2009-06-24
哈尔滨建成北方专用车有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the splicing and welding of the head of the 16MnDR low-temperature pressure vessel, it needs to be normalized at 900-930°C after welding, and then treated at 600-640°C to eliminate welding stress. The test proves that the weld seam tensile strength and low-temperature impact of the head splicing Reduced toughness
In order to meet the service performance of the 16MnDR low-temperature pressure vessel tank, conventional submerged arc welding wire and flux were used in the previous welding process, and the submerged arc automatic welding process was first used for welding. After normalizing, the original weld was planed off. Then use electrode arc welding to re-weld the weld again. It needs to be welded twice, and the original weld should be planed off once. This will not only cause a certain economic loss to the manufacturer, but also increase the labor intensity of the workers and increase the manufacturing cycle. , which increases the production cost of the product
In addition, there is also the problem that the tensile strength and impact toughness index of the splicing part of the tank head in the normalized state decreases, which makes it difficult to meet the use requirements

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0006] Specific embodiment 1: The welding method for the splicing seam of the tank head of the 16MnDR low-temperature pressure vessel in this embodiment is completed by the following steps: 1. Opening the Y-shaped groove: two 16MnDR head splicing plates are arranged in a row, Two 16MnDR head splicing plates have a Y-shaped groove on the splicing end surface; 2. One side welding of the Y-shaped groove: automatic submerged arc welding is used to weld one side of the Y-shaped groove of the two 16MnDR head splicing plates , The welding wire grade is H09MnDR, the diameter of the welding wire is Φ4mm; the flux grade is SJ305, the drying temperature is 340~360℃, the drying time is 1~2h; the welding current is 650~710A, the arc voltage is 34~36V, and the welding speed is 48~50cm / min; 3. Gouging to clean the roots: use a carbon arc gouging machine to goug the back of the weld to clean the roots; 4. Weld the back weld: use submerged arc automatic welding to weld two 16MnDR head splicing pla...

specific Embodiment approach 2

[0007] Embodiment 2: The difference between this embodiment and the first embodiment is: in step 2, the drying temperature is 350°C, the drying time is 1h; the welding current is 650A, the arc voltage is 36V, and the welding The speed is 48 cm / min. The welds welded by this method have beautiful appearance, uniform welding waves, no cracks, pores, undercuts, incomplete penetration and slag and other welding defects in the weld and heat-affected zone. According to JB47302.2-2005 "Pressure equipment without damage Inspection" 100% radiographic inspection is required, and the qualification rate (including level II or above) is 100%.

specific Embodiment approach 3

[0008] Embodiment 3: The difference between this embodiment and Embodiment 1 is: in step 4 of this embodiment, the drying temperature is 350°C, the drying time is 1h; the welding current is 680A, the arc voltage is 36V, and the welding The speed is 48 cm / min. The welds welded by this method have beautiful appearance, uniform welding waves, no cracks, pores, undercuts, incomplete penetration and slag and other welding defects in the weld and heat-affected zone. According to JB47302.2-2005 "Pressure equipment without damage Inspection" 100% radiographic inspection is required, and the qualification rate (including level II or above) is 100%.

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Abstract

The invention provides a method for welding a joint welding seam of a sealing head of a tank body of a 16MnDR low-temperature pressure vessel and relates to a method for welding the joint welding seam of the sealing head of the tank body of the pressure vessel. The method solves the problem that indexes of tensile strength and impact toughness at the joint of the sealing head of the tank body are reduced in the normalizing temperature state in the prior welding process. The method comprises the following steps: 1, opening a Y-type groove on a joint end face of two joint plates of a 16MnDR sealing head; 2, welding one side of the Y-type groove; 3, gouging and chipping back; 4, welding the welding seam on the back; 5, carrying out normalizing temperature treatment at a charging temperature of between 200 and 400 DEG C and a heat preserving temperature of between 900 and 930 DEG C, and keeping the temperature for 10 to 75 minutes; and 6, carrying out annealing treatment at a charging temperature of between 20 and 390 DEG C and a heat preserving temperature of between 600 and 640 DEG C, and keeping the temperature for 40 to 50 minutes and the temperature dropping speed of between 1.0 and 6.7 DEG C / min. Step 2 and step 4 adopt automatic submerged arc welding, wherein the welding wire brand is H09MnDR, the welding wire diameter is Phi 4 millimeters and the flux brand is SJ305, and the drying is performed for 1 to 2 hours at a drying temperature of between 340 and 360 DEG C. The welding current is 650 to 710A, the electric arc voltage is 34 to 36 V, and the welding speed is 48 to 50 cm / min. The method can improve the tensile strength and the low-temperature impact toughness of the welding seam at the joint of the sealing head after the normalizing temperature treatment.

Description

Technical field [0001] The invention relates to a splicing welding seam welding method for the head of a pressure vessel body. Background technique [0002] Due to the splicing and welding of the heads of 16MnDR low-temperature pressure vessels, after welding, it needs to be normalized at 900~930℃, and then treated at 600~640℃ to eliminate welding stress. The test proves the tensile strength and low-temperature impact of the welds at the joints of the heads. Toughness decreases. In order to meet the performance of the 16MnDR low-temperature pressure vessel body, conventional submerged arc welding wire and flux were used in the previous welding process, and the submerged arc automatic welding process was first used for welding. After normalizing treatment, the original weld was gouged out. Then use the electrode arc welding to re-weld this weld again. It needs to be welded twice, and the original weld is removed once. This not only causes a certain economic loss to the manufacture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K33/00B23K9/095
Inventor 何晓峰宋学金
Owner 哈尔滨建成北方专用车有限公司
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