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Submerged-arc welding method for high-strength mixed steel cross joint

A technology of cross joints and welding methods, which is applied to welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of submerged arc welding, avoid arc light and smoke, stabilize welding quality, and improve welding efficiency.

Pending Publication Date: 2021-11-30
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, Q690 and Q550 high-strength steels will have the problem of embrittlement and softening in the heat-affected zone during the welding process. In actual production, semi-automatic gas shielded welding or automatic gas shielded welding with equal strength welding wire is generally used for welding high-strength homogeneous steels. For high-strength mixed steel, low-strength welding wire is used; for the welding of high-strength mixed steel, there is currently no research on submerged arc welding welding methods in China; the welding method based on high-strength mixed steel using submerged arc welding can make welding quality stable and high productivity , to avoid the generation of arc and smoke

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  • Submerged-arc welding method for high-strength mixed steel cross joint
  • Submerged-arc welding method for high-strength mixed steel cross joint

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Experimental program
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Effect test

Embodiment 1

[0029] A high-strength hybrid steel cross joint submerged arc welding method, comprising the following steps:

[0030] S1: Pretreatment of welded steel: Both the vertical plate and the horizontal plate are made of high-strength mixed steel, and a groove is made at the end of the horizontal plate to be welded. The cross-section of the horizontal plate has a trapezoidal structure. The included angle of the plate is 30°~60°, the included angle between the second side wall of the trapezoidal structure and the vertical plate is 30°~60°, and the width of the upper bottom of the trapezoidal structure is 4~5mm;

[0031] S2: Preheating before welding: Preheat the vertical plate and horizontal plate before welding, and the preheating temperature should not be lower than 60°C;

[0032] S3: Bottom welding seam: use low-strength matching welding wire to make a bottom weld bead, welding current 500-550A, welding voltage 30-33V, welding speed 35-40cm / min, heat input 22.5-31.1kJ / cm.

[0033]...

Embodiment 2

[0038] The present invention formulates a submerged arc welding welding process for the high-strength mixed design Q690+Q550 cross joint. The welding process includes the control of its materials and parameters during the welding process, as follows:

[0039] (1) Welding materials: use low-strength matching SUN2M31 welding wire with a diameter of 3.2mm; SU34 welding flux;

[0040] (2) Material description: vertical plate 2 is made of Q690 steel plate; horizontal plate 1 is made of thick Q550 steel plate;

[0041] (3) Groove form: According to the welding position of the material used and the flat welding, X-shaped grooves are used on both sides; the front (θ1) is 45°~60°, the reverse side (θ2) is 45°~60°, and the blunt edge (H) 4~5mm, such as figure 1 shown;

[0042] (4) Preheating before welding: the preheating temperature before welding shall not be lower than 60°C;

[0043] (5) Inter-pass temperature: multi-layer multi-pass welding is adopted, and the inter-pass temperat...

Embodiment 3

[0049] Q690+Q550 high-strength mixed steel cross joint submerged arc welding welding process, welding groove adopts figure 1 The form of the welding consumables is Tianjin Bridge welding consumables.

[0050] Base metal description: the vertical plate is made of 20mm thick Q690 steel plate; the horizontal plate is made of 20mm thick Q550 steel plate;

[0051] Welding equipment: MZC~1250M automatic submerged arc welding truck;

[0052] Soldering flux baking: heat preservation at 350°C for 2 hours;

[0053] Preheating temperature: 60°C, interpass temperature: 120°C~200°C;

[0054] Groove form front (θ1) 45°, back (θ2) 60°, blunt edge (H) 4 ~ 5mm,

[0055]

[0056] Table 1

[0057] Using the welding process in Table 1, the average tensile strength of the cross joint reaches 833.5MPa;

[0058] The average impact energy in the heat-affected zone to 20°C is 266J, and the average impact energy in the weld zone to 20°C is 166J;

[0059] The highest hardness of the cross joint o...

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Abstract

The invention discloses a submerged-arc welding method for a high-strength mixed steel cross joint, and relates to the technical field of high-strength mixed steel welding. The method comprises the following steps that a vertical plate and a transverse plate are made of high-strength mixed steel, and a groove is formed in one end to be welded of the transverse plate; the vertical plate and the transverse plate are preheated before welding, and the preheating temperature is not lower than 60 DEG C; a low-strength matching type welding wire is adopted to conduct bottoming on a welding bead; a low-strength matching type welding wire is adopted for filling the bottomed welding bead; the filled welding bead is covered by adopting a low-strength matching type welding wire. Through the arrangement, the high-strength mixed steel submerged-arc welding technology can be popularized and applied to steel structure buildings.

Description

technical field [0001] The invention relates to the technical field of high-strength mixed steel welding, in particular to a submerged arc welding method for high-strength mixed steel cross joints. Background technique [0002] In recent years, with the progress of my country in the field of metallurgy, low-alloy high-strength steel (steel with yield strength ≥ 460MPa) has received corresponding attention; in steel structure engineering in my country, Q235 and Q355 are the main common steel used. The use of high-strength steel can not only meet the requirements of material performance, but also reduce the amount of steel used. Among them, for components using hybrid design concepts such as hybrid design I-beams, the flanges are made of high-strength (Q690) steel, and the web is made of Low-strength steel (Q550) can not only give full play to the performance of steel, but also reduce costs. [0003] However, Q690 and Q550 high-strength steels will have the problem of embrittle...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/235B23K9/32
CPCB23K9/18B23K9/235B23K9/32
Inventor 狄谨潘延晖张茜秦凤江
Owner CHONGQING UNIV