Manual electric arc welding technology of low-temperature alloy steel plate
A manual arc welding and welding process technology, applied in the field of steel material welding, can solve the problems of difficult to guarantee the performance of welded joints, difficult welding manufacturing process of low-temperature containers, etc., and achieve the effects of excellent comprehensive mechanical properties, excellent mechanical properties, and strong practicability.
Inactive Publication Date: 2013-04-24
NANJING IRON & STEEL CO LTD
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Problems solved by technology
Especially for thick-gauge low-temperature alloy steel, it is difficult to guarantee the performance of welded joints, which brings difficulties to the welding and manufacturing process of low-temperature vessels.
Method used
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Embodiment 1
[0028] A kind of 38mm thick 13MnNi6-3 low-temperature alloy steel manual arc welding welding process, comprising the following steps:
[0029] 38mm thick 13MnNi6-3 low-temperature alloy steel with yield strength ≥ 345MPa produced by normalizing heat treatment with excellent strength and toughness, the welding test plate combination is 38mm+38mm, and the test plate size is 800mm (length) × 200mm (width) × 38mm (thickness) );
[0030] Matching welding materials:
[0031] Electrode deposited metal C: 0.06~0.08%, Mn: 1.2~1.5%, Si: 0.35~0.50%, S: ≤0.01%, P: ≤0.01%, Ni: 0.5~0.7%, Ti: 0.02~0.03% , B: 0.002~0.003%, Mo: ≤0.01%, V: ≤0.01%, and the balance is Fe and unavoidable impurities.
[0032] The wire diameter is Φ4.0mm;
[0033] The manual arc welding groove adopts X-shaped groove, the front groove and the reverse groove angle are both 55°~65°, the root is 0~1mm blunt edge, and the groove assembly gap is 0~3mm.
[0034] Welding process parameters: the preheating temperature be...
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Abstract
The invention discloses a manual electric arc welding technology of a low-temperature alloy steel plate. Welding material which is matched with the low-temperature alloy steel plate and excellent in comprehensive mechanical property is adopted, yield strength ReH of base metal is larger than or equal to 345 megapascal, tensile strength Rm of the base metal ranges from 490-610 megapascal, elongation percentage A of the base metal is larger than or equal to 22%, impacting energy Akv of the base metal at the temperature of -60 DEG C is larger than 27 joules; 13MnNi6-3 low-temperature alloy steel which is 38 millimeters in thickness is welded via manual arc welding in an X-shaped groove; parameters for the welding technology include: welding current ranges from 140-180 amperes, welding voltage ranges from 22-30 volts, welding speed ranges from 18-24 centimeters / minute, welding heat input amount ranges from 15-20 kilojoules / centimeter; butt joints of the 13MnNi6-3 low-temperature alloy steel are welded via multi-layer multiple manual electric arc welding, and interlayer-temperature for welding joints ranges from 60-120 DEG C. The manual electric arc welding technology of the low-temperature alloy steel plate is excellent in comprehensive mechanical property of welding joints, strong in practicality, and applicable to popularization in welding of steel plates of low-temperature vessels.
Description
technical field [0001] The invention belongs to the field of iron and steel material welding, in particular to a manual arc welding process of 38mm thick 13MnNi6-3 low-temperature alloy steel. Background technique [0002] With the rapid development of the national economy and the popularization of cryogenic technology, the application of cryogenic liquids such as liquid nitrogen, liquid oxygen, liquid argon, liquid hydrogen, liquid helium, and liquefied natural gas is becoming more and more extensive. demand is growing. Especially in recent decades, major foreign multinational gas companies have competed to establish joint ventures in my country, bringing advanced air separation equipment, technology and management, which has greatly increased the production of cryogenic liquids in my country, and continuously expanded the region and scope of supply. The price has been greatly reduced, which has promoted the application of cryogenic liquids, driven the development of cryoge...
Claims
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IPC IPC(8): B23K9/00B23K103/04
Inventor 张苏强李丽邢春增何平刘文明汪晶洁
Owner NANJING IRON & STEEL CO LTD