CN101464248B - Method for detecting high-strength steel fillet welding joint performance - Google Patents

Method for detecting high-strength steel fillet welding joint performance Download PDF

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CN101464248B
CN101464248B CN2008102385592A CN200810238559A CN101464248B CN 101464248 B CN101464248 B CN 101464248B CN 2008102385592 A CN2008102385592 A CN 2008102385592A CN 200810238559 A CN200810238559 A CN 200810238559A CN 101464248 B CN101464248 B CN 101464248B
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welding
fillet
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strength steel
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CN101464248A (en
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李亚江
张永兰
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Liaoning Construction Science Research Institute Co Ltd
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Shandong University
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Abstract

The invention relates to a method for testing the performance of a high strength steel fillet welding joint. The method comprises the following steps: 1), test plates of a T-shaped fillet weld are in butt joint with each other, and a single V-shaped groove is formed in the position of the fillet welding joint; 2), the surface of the groove is cleaned up through mechanical treatment before welding; 3), Ar and CO2 mixed gas shielded arc welding or CO2 gas shielded arc welding is adopted; 4), multi-layer and multi-pass welding is carried out by utilizing solid welding wires, and the welding proceeds without interruption; 5), curved samples are cut off, the lateral surfaces of the samples are leveled through mechanical workout and are bent at an angle of 120 DEG; and 6), the fillet welding areas of the bent samples are subjected to macroscopic or microscopic detection. Compared with the conventional method for detecting the welding joint, the invention can achieve the effects of reliably testing the suitable groove angle of a high strength steel fillet welding joint with the tensile strength of 600-800 MPa, the matching level of welding wires and the crack resistance of the welding joint, avoiding unnecessary multi-layer and multi-pass welding, and greatly reducing the welding cost. The invention has the characteristics of simple operation and superior applicability, and facilitates popularization and application as well as improvement of the production efficiency.

Description

Detect the method for high-strength steel fillet welding joint performance
Technical field
The present invention relates to a kind of detection method of property of welded joint, relate in particular to a kind of method that is used to detect tensile strength 600-800MPa Hi-Stren steel fillet welding joint cracking resistance.
Background technology
Hi-Stren steel had both had higher intensity, had good plasticity and toughness again, and it is not only economical to be used for welding product and structure, and can improve usability.Therefore the application of plow-steel in the welding engineering structure is increasingly extensive.
In recent years metallurgical production development of technology, especially computer autocontrol technique smelt, application in the rolling and thermal treatment, for the welding engineering structure provides the important techniques assurance with the development of plow-steel.Especially tensile strength 600-800MPa Hi-Stren steel is because the formation of improving and producing in enormous quantities scale gradually of production technology has been widely used in the important welded structure such as engineering machinery, coal mine hydraulic supporting, bridge at present.Simultaneously, the Application and Development of plow-steel detects welding material, welding technology and welding quality and has higher requirement.
In order to eliminate the welding production efficiency of welding crack and raising tensile strength 600-800MPa plow-steel, CO is adopted in domestic and international similar steel welding mostly 2Shielded welding or mixed gas arc welding mechanization or semi-mechanization welding methods such as (MAG).The strength matching of welding joint has material impact to crack sensitivity, joint performance, is designs for welding structure and the major issue that guarantees property of welded joint.But how to determine that still there are very big dispute at present in the strength matching of plow-steel welding joint and the relation of crack sensitivity.Particularly in the plow-steel, the fillet weld of heavy-gauge sheeting, illustrate the relation of groove angle, welding wire coupling and number of weld passes, also especially be subjected to people's attention.Because reduce the groove angle of fillet weld, can reduce number of weld passes significantly and fill amount of metal, be directly connected to and reduce welding cost and improve welding production efficiency.But, present relation, the still good detection method of neither one for groove angle, welding wire coupling and number of weld passes.
Therefore, if can be under existing welding condition, realization is to the detection of tensile strength 600-800MPa high-strength steel fillet welding joint splitting resistance, the relation of clear and definite groove angle, welding wire coupling and number of weld passes has great importance to simplifying welding technology, raising weld zone performance and reducing production costs.
Summary of the invention
The objective of the invention is for overcoming above-mentioned the deficiencies in the prior art, provide that a kind of easy and simple to handle, applicability is strong, the method for the detection high-strength steel fillet welding joint performance that reduces cost.
For achieving the above object, the present invention adopts following technical proposals: a kind of method that detects high-strength steel fillet welding joint performance may further comprise the steps:
1) the test plate (panel) butt joint form of T shape fillet weld is: on three test plate (panel)s, weld a riser respectively, form T shape structure, and both sides leg weld seam, riser must not deflection; The fillet welding joint place opens single V-butt, and three groove angles are respectively 25 °, 35 °, 45 °;
2) adopt mechanical treatment cleaning groove face before the welding, remove greasy dirt and iron rust;
3) adopt Ar+CO 2Mixed gas arc welding or CO 2Shielded welding; Welding condition is: weldingvoltage 26V～30V, and welding current 160A～310A, speed of welding 0.4cm/s～0.6cm/s, the sweating heat input is controlled at 10kJ/cm～20kJ/cm, shield gas flow rate 10L/min～20L/min;
4) at the plow-steel of tensile strength 600MPa, 700MPa and 800MPa, adopt nominal intensity 600MPa or 700MPa solid core welding wire to carry out multi-pass welding respectively, continuous sequence does not rest midway;
5) cut at least 3 bend specimens along the weld seam vertical direction, sample side machining is smooth, and carry out 120 ° of bendings;
6) the crooked result of sample is carried out macroscopic view or microcosmic detection: it is to utilize 5-10 times of magnifier by naked eyes Direct observation fillet weld district that macroscopic view detects; It is by metaloscope the fillet weld district of bend specimen to be detected that microcosmic detects.
Described step 2) mechanical treatment in is with wire brush the iron rust of groove face to be removed totally, makes it expose metallic luster.
Ar+CO in the described step 3) 2Ar and CO that mixed gas arc welding is adopted 2Percent by volume be 80%: 20%.
The diameter of the 600MPa in the described step 4), 700MPa solid core welding wire is 1.2mm.
The chemical constitution that comprises following percentage by weight in the 600MPa solid core welding wire in the described step 4): C＜0.11%, Si0.5%～0.80%, Mn 1.5%～1.9%, and Mo 0.3%～0.5%; The deposit metal mechanical property of 600MPa solid core welding wire is: tensile strength sigma b＞670MPa, yield strength σ s＞545MPa, length growth rate δ＞25% ,-40 ℃ of impact absorbing energy A KV＞g5J.
The chemical constitution that comprises following percentage by weight in the 700MPa solid core welding wire in the described step 4): C＜0.10%, Si0.4%～0.8%, Mn 1.25%～1.80%, and Mo 0.3%～0.6%, and Ni 0.5%～1.0%; 700MPa solid core welding wire deposit metal mechanical property is: tensile strength sigma b＞750MPa, yield strength σ s＞700MPa, length growth rate δ＞21% ,-40 ℃ of impact absorbing energy A KV＞100J.
Multi-pass welding in the described step 4), except the prime coat welding bead, interlayer temperature is controlled at 60～150 ℃ during all the other each layer welding bead weldings.
Macroscopic view detection and microcosmic detection all are prior aries among the present invention, do not repeat them here.
The present invention adopts Ar+CO 2Mixed gas arc welding, other welding wire of different intensity scale cooperates suitable groove angle, the method that proposes with the present invention detects, can determine suitable fillet weld groove angle, make weld metal have higher plasticity and toughness deposit, root of weld good toughness can prevent the generation and the expansion of fusion area and root of weld micro-crack, has fine splitting resistance; Even under the condition of not preheating, not post weld heat treatment, also can avoid welding crack effectively.
Compare with the welding joint detection method of routine, adopt the detection method at tensile strength 600-800MPa high-strength steel fillet welding joint performance of the present invention, can mate and the welding joint splitting resistance by suitable groove angle, the welding wire of reliable detection, avoid unnecessary multilayer multiple tracks welding, can also significantly reduce welding cost, enhance productivity.Therefore, the detection method of fillet welding joint performance of the present invention has easy and simple to handle, characteristic of strong applicability, and is easy to utilize and reduce production costs.
Description of drawings
Fig. 1 is a fillet weld structural representation of the present invention;
Fig. 2 is that pin weld seam of the present invention is finished structural representation;
Fig. 3 is that fillet weld sample of the present invention cuts position view;
Wherein 1. test plate (panel)s, 2. riser, 3. groove.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Embodiment 1:
Mother metal: as shown in Figure 1, thickness is the Q550 low-alloy hardening high-strength steel of 20mm, welds the riser 2 of a tile height 45mm on three test plate (panel)s 1 at 300mm * 300mm respectively, forms T shape structure.Riser 2 is opened 3, three groove 3 angles of single V-butt with test plate (panel) 1 corner connection place and is respectively 25 °, 35 °, 45 °.
Welding material: 600MPa shield-arc welding solid core welding wire, diameter are 1.2mm.
Welding method: Ar+CO 2Mixed gas arc welding, wherein Ar and CO 2Percent by volume be 80%: 20%.
Welding condition: weldingvoltage 28V～29V, welding current 240V～270A, speed of welding 0.4cm/s～0.5cm/s, sweating heat input 13.4kJ/cm～19.6kJ/cm, shield gas flow rate 15～20L/min; The welding number of plies: 3 layers, adopt multi-pass welding; Number of weld passes: 8 roads during 25 ° of groove angles, 16 roads in the time of 35 °, 28 roads in the time of 45 °.
Solder technology main points: be to weld under 24 ℃ the not preheating condition in room temperature, adopt mechanical treatment cleaning groove face before the welding, remove greasy dirt and iron rust; Except the prime coat welding bead, should keep 60～120 ℃ interlayer temperature during the welding of second layer welding bead, make the first road welding bead play pre-heat effect (diffusion that also helps hydrogen is overflowed).Continuous sequence must not rest midway.Postwelding takes silicate aluminum board to cover the slow cooling measure of weld region.The postwelding joint is intact, no face of weld crackle and root crack.As shown in Figure 2.
Cut 3 bend specimens by shown in Figure 3 along the weld seam vertical direction, sample side machining is smooth, carry out 120 ° of bendings.Crooked result detects to sample: it is to utilize 5-10 times of magnifier by the naked eyes Direct observation that macroscopic view detects; It is by metaloscope bend specimen to be detected that microcosmic detects.
Test findings shows, the cracking resistance of the fillet welding joint of acquisition is the best during with 35 ° of groove angles, reduces welding several 12 roads, road during than 45 ° of groove angles.
Embodiment 2:
Mother metal: as shown in Figure 1, the HQ80 Hi-Stren steel of thickness 30mm, the riser 2 of three T junctions is opened 25 °, 35 °, 45 ° single V-butts 3 respectively, and test plate (panel) 1 is of a size of 300mm * 300mm, and riser 2 is of a size of 300mm * 60mm.
Welding material: 800MPa shield-arc welding solid core welding wire, diameter are 1.2mm.
Welding method: Ar+CO 2Mixed gas arc welding, wherein Ar and CO 2Percent by volume be 80%: 20%.
Welding condition: weldingvoltage 27V～28V, welding current 230A～260A, speed of welding 0.5cm/s, sweating heat input 12.4kJ/cm～14.6kJ/cm, shield gas flow rate 16～18L/min, the welding number of plies: 3 layers, adopt multi-pass welding.Number of weld passes: 10 roads during 25 ° of groove angles, 21 roads in the time of 35 °, 35 roads in the time of 45 °.
Solder technology main points: be to weld under 24 ℃ the not preheating condition in room temperature, adopt mechanical treatment cleaning groove face before the welding, remove greasy dirt and iron rust; Except the prime coat welding bead, should keep 80～150 ℃ interlayer temperature during all the other each layer welding bead weldings, make preceding one welding bead play pre-heat effect (diffusion that also helps hydrogen is overflowed).Continuous sequence must not rest midway.
The postwelding joint is intact, no face of weld crackle, as shown in Figure 2.
By shown in Figure 3, cut 3 bend specimens along the weld seam vertical direction, sample side machining is smooth, carry out 120 ° of bendings.Crooked result detects to sample: it is to utilize 5-10 times of magnifier by the naked eyes Direct observation that macroscopic view detects; It is by metaloscope bend specimen to be detected that microcosmic detects.
Test findings shows, the cracking resistance of the fillet welding joint of acquisition is the best during with 35 ° of groove angles, reduces welding several 14 roads, road during than 45 ° of groove angles.
In the above-described embodiment: described mechanical treatment is with wire brush or hand operated grinding wheel polishing the iron rust of groove face to be removed totally, makes it expose metallic luster.
Comprise following chemical constitution: C 0.07% in the 600MPa solid core welding wire, Si 0.60%, and Mn 1.45%, and Mo 0.38%; Mechanical property is: the deposit metal tensile strength sigma b＞670MPa, yield strength σ s＞545MPa, length growth rate δ＞25% ,-40 ℃ of impact absorbing energy A KV＞85J.
Comprise following chemical constitution: C 0.07% in the 700MPa solid core welding wire, Si 0.45%, and Mn 1.24%, and Mo 0.42%, Ni1.51%; The deposit metal mechanical property is: tensile strength sigma b＞750MPa, yield strength σ s＞700MPa, length growth rate δ＞21% ,-40 ℃ of impact absorbing energy A KV＞100J.

Claims (4)

1. a method that detects high-strength steel fillet welding joint performance is characterized in that, may further comprise the steps:
1) the test plate (panel) butt joint form of T shape fillet weld is: on three test plate (panel)s, weld a riser respectively, form T shape structure, and both sides leg weld seam, riser must not deflection; The fillet welding joint place opens single V-butt, and three groove angles are respectively 25 °, 35 °, 45 °;
2) adopt mechanical treatment cleaning groove face before the welding, remove greasy dirt and iron rust;
3) adopt Ar+CO 2Mixed gas arc welding or CO 2Shielded welding; Welding condition is: weldingvoltage 26V～30V, and welding current 160A～310A, speed of welding 0.4cm/s～0.6cm/s, the welding heat input is controlled at 10kJ/cm～20kJ/cm, shield gas flow rate 10L/min～20L/min;
4) at the plow-steel of tensile strength 600MPa, 700MPa and 800MPa, adopt nominal intensity 600MPa or 700MPa solid core welding wire to carry out multi-pass welding respectively, continuous sequence does not rest midway;
The chemical constitution that comprises following percentage by weight in the described 600MPa solid core welding wire: C＜0.11%, Si 0.5%～0.80%, and Mn 1.5%～1.9%, and Mo 0.3%～0.5%; The deposit metal mechanical property of 600MPa solid core welding wire is: tensile strength sigma b＞670MPa, yield strength σ s＞545MPa, length growth rate δ＞25% ,-40 ℃ of impact absorbing energy A KV＞85J;
The chemical constitution that comprises following percentage by weight in the described 700MPa solid core welding wire: C＜0.10%, Si 0.4%～0.8%, and Mn 1.25%～1.80%, and Mo 0.3%～0.6%, and Ni 0.5%～1.0%; 700MPa solid core welding wire deposit metal mechanical property is: tensile strength sigma b＞750MPa, yield strength σ s＞700MPa, length growth rate δ＞21% ,-40 ℃ of impact absorbing energy A KV＞100J;
Multi-pass welding in the described step 4), except the prime coat welding bead, interlayer temperature is controlled at 60～150 ℃ during all the other each layer welding bead weldings;
5) cut at least 3 bend specimens along the weld seam vertical direction, sample side machining is smooth, and carry out 120 ° of bendings;
6) the crooked result of sample is carried out macroscopic view or microcosmic detection: it is to utilize 5-10 times of magnifier by the naked eyes Direct observation that macroscopic view detects; It is by metaloscope bend specimen to be detected that microcosmic detects.
2. the method for detection high-strength steel fillet welding joint performance according to claim 1 is characterized in that: the mechanical treatment described step 2) is with wire brush the iron rust of groove face to be removed totally, makes it expose metallic luster.
3. the method for detection high-strength steel fillet welding joint performance according to claim 1 is characterized in that: the Ar+CO in the described step 3) 2Ar and CO that mixed gas arc welding is adopted 2Percent by volume be 80%: 20%.
4. the method for detection high-strength steel fillet welding joint performance according to claim 1 is characterized in that: the diameter of the 600MPa in the described step 4), 700MPa solid core welding wire is 1.2mm.
CN2008102385592A 2008-12-18 2008-12-18 Method for detecting high-strength steel fillet welding joint performance Active CN101464248B (en)

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TWI396600B (en) * 2009-08-24 2013-05-21 Nippon Steel & Sumitomo Metal Corp Out-of-plane gusset weld joints and manufacturing method therefor
CN101975702B (en) * 2010-09-15 2012-09-05 河北省电力研究院 Impact energy test of metallic weld seam and calculation method
CN102435498A (en) * 2011-12-02 2012-05-02 中国石油天然气第七建设公司 Pull-off force test method
CN103769782B (en) * 2014-02-14 2015-10-07 南通中远川崎船舶工程有限公司 The welding method of a kind of super-container vessel longitudinal powerful portion material
CN105499824A (en) * 2016-01-25 2016-04-20 重庆长征重工有限责任公司 Single-slope V-groove structure for steel plate welding
CN114178656A (en) * 2021-12-03 2022-03-15 大连船舶重工集团有限公司 Welding method for corrosion-resistant steel of crude oil tanker

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