Welding materials, their applications and welding methods

A welding material and welding method technology, applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of high tendency of cold cracking, etc., to compensate for the reduction of strength, reduce the tendency of hardening and crack sensitivity , the effect of reducing the likelihood

Active Publication Date: 2015-10-28
ZOOMLION HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a welding material, its application and welding method to solve the technical problems that the weld seam is easy to form brittle and hard martensitic structure and has a large tendency of cold cracking when welding high-strength steel in the prior art

Method used

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  • Welding materials, their applications and welding methods
  • Welding materials, their applications and welding methods
  • Welding materials, their applications and welding methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The diameter of the welding wire is 1.2mm, and the chemical composition of the welding wire is C: 0.025%, Mn: 1.449%, Si: 0.411%, B: 0.003%, Ti: 0.158%, V: 0.016%, Ni: 2.879%, Cu: 0.142% , Cr: 0.258%, S≤0.01%, P≤0.01%, and the balance of Fe.

[0048] The welding material of the present invention and the existing comparative welding wire of the same level are used to carry out the laser-arc hybrid welding test. The chemical composition of the two welding wires is shown in Table 1. The ratio of welding wire is 25.1% lower.

[0049] The test steel plate adopts Weldox960 high-strength steel plate, plate thickness 12mm, groove angle 30°, Y-shaped groove plate butt joint. Welding process parameters are: laser power P=5kW, defocus z=-1, laser and arc relative position Dla=2mm, welding current I=230~260A, welding voltage U=26~28V, dry elongation L=12mm , laser protection gas is 30%He+70%Ar, flow rate Q1=12L / min, arc protection gas is 80%Ar+20%CO 2 , Flow Q2=22L / min, welding ...

Embodiment 2

[0052] The diameter of the welding wire is 1.2mm, and the chemical composition of the welding wire is C: 0.011%, Mn: 1.198%, Si: 0.302%, B: 0.002%, Ti: 0.081%, V: 0.009%, Ni: 2.196%, Cu: 0.102% , Cr: 0.101%, S≤0.01%, P≤0.01%, and the balance of Fe.

[0053] The carbon equivalent (CE) of this welding wire is 44.7% lower than that of the comparative welding wire of the same level.

[0054] The test steel plate adopts Weldox960 high-strength steel plate, plate thickness 12mm, groove angle 30°, Y-shaped groove plate butt joint. The welding process parameters are: laser power P=4kW, defocus amount z=1, relative position of laser and arc Dla=1mm, welding current I=200~230A, welding voltage U=24~26V, dry elongation L=16mm, Laser protection gas is 30%He+70%Ar, flow rate Q1=15L / min, arc protection gas is 80%Ar+20%CO 2 , Flow Q2=25L / min, welding speed v=50cm / min.

[0055] After welding and cooling, conduct microhardness measurement and mechanical performance test on the deposited met...

Embodiment 3

[0057] The diameter of the welding wire is 1.2mm, and the chemical composition of the welding wire is C: 0.04%, Mn: 1.696%, Si: 0.595%, B: 0.004%, Ti: 0.20%, V: 0.02%, Ni: 3.20%, Cu: 0.299% , Cr: 0.40%, S≤0.015%, P≤0.015%, and the balance of Fe.

[0058] The carbon equivalent (CE) of this welding wire is 6.1% lower than that of the comparative welding wire of the same level.

[0059] The test steel plate adopts Weldox960 high-strength steel plate, plate thickness 12mm, groove angle 30°, Y-shaped groove plate butt joint. Welding process parameters are: laser power P=6kW, defocus z=-2, laser and arc relative position Dla=2mm, welding current I=270~300A, welding voltage U=28~30V, dry elongation L=11mm , laser shielding gas is 30%He+70%Ar, flow Q1=10L / min, arc shielding gas is 80%Ar+20%CO 2 , Flow Q2=20L / min, welding speed v=80cm / min.

[0060] After welding and cooling, conduct microhardness measurement and mechanical performance test on the deposited metal. The specific test m...

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Abstract

The invention discloses a welding material, an application thereof and a welding method thereof. The welding material comprises, by weight, 0.01%-0.04% of C, 1.2%-1.7% of Mn, 0.3%-0.6% of Si, 0.002%-0.004% of B, 0.08%-0.20% of Ti, 0.01%-0.02% of V, 2.2%-3.2% of Ni, 0.10%-0.30% of Cu, 0.10%-0.40% of Cr, less than or equal to 0.015% of S, less than or equal to 0.015% of P and the balance Fe. The application refers to application of the welding material in high-strength steel laser-electric arc composite welding. According to the technical scheme, by the adoption of the welding material, the carbon content and the equivalent carbon content in welding seam deposited metal are very low, the probability of martensite structural transformation is lowered, and the quench hardening intendancy and the crack sensitivity of a welding seam are reduced.

Description

technical field [0001] The invention relates to the technical field of welding materials and welding processes, in particular, to a welding material, its application and a welding method. Background technique [0002] Laser-arc hybrid welding is a welding method that uses the energy of two heat sources, laser welding and arc welding, to act on the workpiece together, and generates the same molten pool through the interaction of the two. Usually, the specific operation diagram is as follows: Figures 1 to 3 shown. in, figure 1 A schematic diagram of the front view structure showing the relative positional relationship of each device in the laser-arc hybrid welding process, figure 2 based on figure 1 The right-view structure diagram of image 3 It is a three-dimensional schematic diagram of the relative positional relationship of each device in the laser-arc hybrid welding process. It can be seen from the above figure that the laser generator 2 and the arc welding torch ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B23K35/30B23K26/348
CPCB23K26/348B23K35/3066
Inventor王霄腾谭星任会礼付玲
OwnerZOOMLION HEAVY IND CO LTD