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Narrow gap laser hot-wire-filling welding process for 316LN thick plate

A hot wire welding and narrow gap technology, which is applied in the field of narrow gap laser filling hot wire welding technology, can solve the problems affecting the performance of welded joints, thermal cracks, and the difficulty of exacerbating thermal deformation, and achieve good detection results, small heat input, The effect of small deformation

Active Publication Date: 2015-07-01
KEJU HIGH TECH HEFEI
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  • Claims
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Problems solved by technology

However, the addition of N also intensifies the difficulty of thermal deformation of 316LN, and the difficulty of welding is also much higher than that of 316L. Thermal cracks are prone to occur during welding, which affects the performance of welded joints.

Method used

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  • Narrow gap laser hot-wire-filling welding process for 316LN thick plate
  • Narrow gap laser hot-wire-filling welding process for 316LN thick plate

Examples

Experimental program
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Effect test

specific Embodiment

[0016] Carry out butt welding of a pair of 316LN plates with a thickness of 20mm, a length of 300mm and a width of 150mm, see figure 1 . The groove angle is 6°, the blunt edge depth is 5mm, and b=2mm.

[0017] Press the test plate first figure 1 The group is good, the specific number of welding layers distribution see figure 1 .

[0018] The welding parameters used in the welding process are shown in Table 1:

[0019] Table 1 Welding parameter list

[0020]

[0021] The wire feed angle is 40°±2°, and the laser beam angle is 7°-10° from the vertical direction.

[0022] After welding, the test plate was tested according to the ISO 15614-11 standard and the B-level level in ISO13919-1, and the non-destructive testing was all qualified. Take 4 side bending specimens, 3 impact specimens, grain size evaluation, and 2 tensile specimens. There is no crack in side bending at 180°; weld seam and heat-affected zone -196°C, impact absorption capacity ≥ 107J; grain size grade is ...

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Abstract

The invention discloses a narrow gap laser hot-wire-filling welding process for a 316LN thick plate. Solder wires are heated through current, base metal is heated through laser, and solder wire transition stability and deposition efficiency are increased. The process includes: machining a welding part of a stainless steel welding plate into a V-shaped groove with a truncated edge 1.8-2.2mm in size and a top-end groove 3.0-4.0mm in size, selecting solder wire brand as 1.4455 and solder wire diameter as 1.2mm, bottoming through laser hot wire filling, performing laser hot wire filling with each layer not more than 3mm, and welding a cover face through laser hot wire filling. By the process, narrow gap welding of the 316LN thick plate is achieved, and welding is stable. The welded joint obtained by the method is attractive in welding joints, low in welding deformation, good in joint performance, and free of cracks, air holes and the like.

Description

technical field [0001] The invention relates to the technical field of laser wire-filled welding, in particular to a narrow-gap laser-filled hot-wire welding process for 316LN thick plates. Background technique [0002] 316LN is a 300 series austenitic stainless steel with low C and N content. This steel not only has good plasticity, but also has high corrosion resistance. For general austenitic stainless steel, it is a low-strength material under the condition of solution treatment, and it can only be strengthened through the subsequent cold working process. If the subsequent deformation is too large, a part of these steels will form deformation-induced martensite and thus become magnetic. However, the N-alloyed 316LN austenitic stainless steel has high strength even after solution treatment, and it will not deform and induce martensite after subsequent large deformation, indicating that this steel is completely non-magnetic. After adding N and Mn alloy elements, it shows...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/24B23K26/60
Inventor 方超宋云涛卫靖李鸿炜张书权
Owner KEJU HIGH TECH HEFEI
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