CN1867418A - Weld structure having excellent brittle crack propagation resistance and method of welding the weld structure - Google Patents
Weld structure having excellent brittle crack propagation resistance and method of welding the weld structure Download PDFInfo
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- CN1867418A CN1867418A CN200480029748.9A CN200480029748A CN1867418A CN 1867418 A CN1867418 A CN 1867418A CN 200480029748 A CN200480029748 A CN 200480029748A CN 1867418 A CN1867418 A CN 1867418A
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Abstract
This present invention relates to a welding method for manufacturing welded structures having excellent properties to prevent the propagation of brittle fracture occurring in welded joints, characterized by the step of forming a repair weld having a greater toughness than that of a butt weld and an outer edge whose angle with respect to the longitudinal direction of the butt weld is not less than 10 degrees and not more than 60 degrees, by applying repair welding to a region to arrest a brittle crack in a butt-welded joint where a brittle crack is likely to propagate after removing part of the butt-welded joint, in said region, by gouging or machining.
Description
Technical field
The present invention relates to stop the welding structural body and the welding method thereof of anti-brittle-cracking propagation excellence of the propagation of the brittle crack that on welding point, produces.
Specifically, the welding method of welding structural body of anti-brittle-cracking propagation excellence that relates to the propagation of the brittle crack that prevention might produce on the welding point of welded structure, described welded structure uses slab and uses the large-line energy welding, relates to the technology of the security that can improve building structure and building steel structure etc.
Background technology
Must use welding in order to build steel structure, and, use the large-line energy welding widely to reduce construction cost or to improve efficiency of construction as purpose.When particularly steel plate thickness increased, number increased by leaps and bounds during owing to the Welder, and therefore urgent expectation is welded with the large-line energy until the limit.
But during the welding of use large-line energy, because the toughness value in welding heat affected (HAZ) district descends, the width in HAZ district also increases, so have the tendency for the fracture toughness value decline of brittle fracture.
Therefore, even for example special flat 6-88161 communique and the clear 60-245768 communique of Te Kai opened discloses and uses the large-line energy welding also to be difficult to reduce the invention of steel of the fracture toughness in HAZ district.
In these inventions, because improved fracture toughness value as the Resistance Value that produces with respect to brittle fracture, therefore the possibility of brittle fracture is suppressed extremely lowly under common environment for use, but under the improper situation of accident that earthquake and works bump against each other, disaster etc., in case generation brittle fracture, have brittle crack and propagate in the HAZ district, so the danger of extensive fracture.
So far it is believed that, in the welding point of the TMCP steel plate about use thickness of slab 25mm etc., even owing to produce brittle crack, residual stress because of the weld zone, brittle crack also can be transferred to the mother metal side from weld region, as long as so guarantee the crack arrest characteristic of mother metal, even, also can brittle crack be stopped in case weld region produces brittle crack.
But, when steel structure maximizes, use the thicker steel plate of thickness of slab, simplify the structure in order to make in addition, the steel plate wall thickening also is effectively, thereby is using the steel plate of the high high strength steel of design stress.
In such steel plate, degree because of the fracture toughness of weld region, brittle crack does not shift in mother metal and propagates along the heat affected area of weld region, can show this point by the inventor by the large-scale destructive test that 8000 ton large-scale testing machines carry out.
According to the test of being undertaken by the inventor relevant with the steel plate brittle fracture, as shown in Figure 1, when the mode that intersects on thickness of slab 50mm or the steel plate below it, with the butt welded joint district with steel plate 1 is installed timber 3 (stiffener) by fillet welding, in most cases, even on steel plate 1, produce brittle crack, also can stop the propagation (crack arrest) of brittle crack by timber, to such an extent as to steel plate 1 does not rupture.
But when thickness of slab thickened, even timber is installed, also irrelevant with timber 3 sometimes, brittle crack did not shift to mother metal, and along the HAZ district or weld metal portion and propagating.
Summary of the invention
Here, problem of the present invention is, is provided at the occasion that in a single day produces brittle crack at the welding point place, thereby can prevents that the propagation of brittle crack from preventing the welding structural body and the welding method thereof of the fatal fracture of welding structural body by the repair welding district.
The inventor finds, by welding structural body is carried out specific repair welding, can prevent the brittle-cracking propagation of welding point, and large-scale damage is prevented trouble before it happens, and has finished the present invention thus.
Main idea of the present invention is as described below.
(1) a kind of welding method of welding structural body of anti-brittle-cracking propagation excellence, the welding method of this welding structural body can stop the propagation of the brittle crack of welding point place generation, it is characterized in that:
In the butt joint of the possibility of the crack propagation that enbrittles, for the zone that brittle crack is stopped, by this part of repair welding, form and to have the high toughness of comparison welding zone and be the repair welding districts of 10 degree～60 degree with respect to angle Φ to the direction of outer rim longitudinally of welding zone.
According to the welding method of the welding structural body of above-mentioned (1) described anti-brittle-cracking propagation excellence, it is characterized in that (2) toughness in above-mentioned repair welding district is compared with fragility-ductile fracture face transition temperature vTrs to welding zone, low at least 20 ℃ or more than it.
(3) according to the welding method of the welding structural body of above-mentioned (1) or (2) described anti-brittle-cracking propagation excellence, it is characterized in that, above-mentioned repair welding, by any one party or two sides for the surface and the back side of butt joint, gouge (gouging) or machining are removed after 1/2 or its above scope of thickness of slab, and this part is carried out repair welding.
(4) according to the welding method of the welding structural body of any described anti-brittle-cracking propagation excellence of above-mentioned (1)～(3), it is characterized in that, in the join domain of above-mentioned repair welding district and butt joint, with to the vertical vertical direction of welding zone on produce 1/2 or the compressive residual stress more than it of the yield stress YP of soldered member.
(5) according to the welding method of the welding structural body of any described anti-brittle-cracking propagation excellence of above-mentioned (1)～(4), it is characterized in that, in the repair welding welding bead of the final at least floor in above-mentioned repair welding district, to be controlled to be 80 degree with respect to the θ of angle longitudinally or below it, thereby implement repair welding the welding bead of repair welding longitudinally of welding zone.
(6) according to the welding method of the welding structural body of any described anti-brittle-cracking propagation excellence of above-mentioned (1)～(5), it is characterized in that, to be controlled to be 10 degree～45 degree with respect to the angle Φ of the outer rim direction in the above-mentioned district of repair welding longitudinally to welding zone, thereby implement repair welding.
(7) a kind of welding structural body of anti-brittle-cracking propagation excellence, this welding structural body stops the propagation of the brittle crack of welding point place generation, it is characterized in that, in the butt joint of the possibility of the crack propagation that enbrittles, in the zone that brittle crack is stopped, having with welding zone is compared and have high toughness and be the repair welding districts of 10 degree～60 degree with respect to angle Φ to the direction of outer rim longitudinally of welding zone.
According to the welding structural body of above-mentioned (7) described anti-brittle-cracking propagation excellence, it is characterized in that (8) toughness in above-mentioned repair welding district is compared with fragility-ductile fracture face transition temperature vTrs to welding zone, low at least 20 ℃ or more than it.
(9) according to the welding structural body of above-mentioned (7) or (8) described anti-brittle-cracking propagation excellence, it is characterized in that, above-mentioned repair welding district is on any one party or two sides at the surface of butt joint and the back side, according to 1/2 or scope more than it of thickness of slab and have.
(10) according to the welding structural body of any described anti-brittle-cracking propagation excellence of above-mentioned (7)～(9), it is characterized in that, in the join domain of above-mentioned repair welding district and butt joint, with vertical vertical direction to welding zone on have 1/2 or the compressive residual stress more than it of the yield stress YP of soldered member.
(11) according to the welding structural body of any described anti-brittle-cracking propagation excellence of above-mentioned (7)～(10), it is characterized in that, in the repair welding welding bead of the final at least floor in above-mentioned repair welding district, be 80 to spend or below it with respect to the θ of angle longitudinally to the welding bead of repair welding longitudinally of welding zone.
(12) according to the welding structural body of any described anti-brittle-cracking propagation excellence of above-mentioned (7)～(11), it is characterized in that, is 10 degree～45 degree with respect to the angle Φ of the outer rim direction in the above-mentioned district of repair welding longitudinally to welding zone.
According to the present invention, carry out specific repair welding by a part, even, also can prevent the propagation of brittle crack by the weld zone in case produce the occasion of brittle crack at welding point to butt joint.
Description of drawings
Fig. 1 is the figure that the welding structural body of timber is disposed in expression.
Fig. 2 is the figure that the welding structural body of repair welding has been implemented in explanation.
Fig. 3 is the figure of the welding method of the expression welding structural body that is used to prevent brittle-cracking propagation.
Fig. 4 is the figure of the employed test film of the expression embodiment of the invention.
The specific embodiment
Explain with Fig. 2～4 and to be used to implement preferred forms of the present invention.
Fig. 2 is the figure of the butt joint of the expression steel plate of using welding method of the present invention.In Fig. 2,2 expression butt joints, 5 expressions are to welding zone, and 6 represent the repair welding districts.
Repair welding of the present invention district is characterised in that, in the butt joint 2 (to the heat affected area of welding zone 5 and steel plate 1) of the possibility of as shown in Figure 2 the crack propagation that enbrittles, with respect to the zone that brittle crack is stopped, remove the part of this regional butt joint 2 (to the heat affected area of welding zone 5 and steel plate 1) by gouge or machining, then, come this part of repair welding by the welding material with tenacity excellent, repair welding forms and to have the high toughness of comparison welding zone 5 thus, and be the repair welding districts 6 of 10 degree～60 degree with respect to angle Φ to the direction of outer rim longitudinally of welding zone 5.
The brittle crack that the welding point place produces can propagating welding zone 5 or the heat affected area that is easy to generate the steel plate 1 of residual-tensile stress at butt joint 2, but find, have the high toughness of comparison welding zone 5 and be the repair welding districts 6 that 10 degree～60 are spent by in making the zone that brittle crack stops, forming with respect to angle Φ to the direction of outer rim longitudinally of welding zone 5, can make along the brittle crack that the heat affected area of welding zone 5 or steel plate 1 is propagated and shift, lead to the mother metal portion of steel plate 1, stop the propagation of crackle.
This effect, be applied to as shown in Figure 1 the iron timber 3 (enhancing material) of level to carry out the occasion of the welding structural body of fillet welding 4 with the mode that welding zone 5 is intersected of vertical member (steel plate 1), thereby can make to shift along the brittle crack that the heat affected area of welding zone 5 or steel plate 1 is propagated by repair welding district 6 leads to iron timber 3 (enhancing material), and stop the propagation of crackle, thereby can bring into play more significant effect.
In addition, even there is not the welding structural body of iron timber 3 shown in Figure 1 (enhancing material), thereby also can make to shift along the brittle crack that the heat affected area of welding zone 5 or steel plate 1 is propagated by repair welding district 6 leads to steel plate 1, and stop the propagation of crackle, thereby, self-evident, welding structural body shown in Figure 1 is not limited.
In the present invention, the degree of depth of gouge or machining is, any one party or two sides with respect to the surface and the back side of butt joint 2, remove 1/2 or scope more than it of thickness of slab with gouge or machining, then by on this part, forming the repair welding district 6 of above-mentioned tenacity excellent, can stop propagating crack more reliably, improve anti-brittle-cracking propagation, thus preferred.
Among the present invention, with respect to the time to bigger grade of angle Φ of the direction of outer rim longitudinally of welding zone 5, when butt joint 2 to the heat affected area of welding zone 5 or steel plate 1 in propagate that the brittle crack come is not transferred to steel plate 1 side or timber 3 sides and when entering in the repair welding district 6, if the toughness in repair welding district 6 comparison welding zone 5 is low, then crackle can not stop after invading repair welding district 6, and crackle is further propagated along the heat affected area to welding zone 5 or steel plate 1 of butt joint 2.
Therefore, in the present invention, in repair welding district 6, welding material with the fracture toughness excellence carries out repair welding, and form the fracture toughness value and compare low at least 20 ℃ or the repair welding district 6 of excellent toughness like that more than it with fragility-ductile fracture face transition temperature vTrs welding zone 5, thus, the brittle crack of propagating along the heat affected area to welding zone 5 or steel plate 1 of butt joint 2, even enter a side that can not transfer to steel plate 1 side or timber 3 sides under the situation in the repair welding district 6, also can in repair welding district 6, stop the propagation of crackle, thus preferred.
In addition, the method of the fracture toughness of the weld metal in raising repair welding district 6 needn't be done special qualification, can use following method, promptly, by using the welding material that contains 2 quality % or the Ni more than it in the welding wire for example to carry out repair welding, weld metal is adjusted in the scope of above-mentioned toughness value as the welding material of tenacity excellent.
Fig. 3 is the details drawing in the used repair welding district of welding method of the present invention.
In Fig. 3,2 expression butt joints, 5 expressions are to welding zone, and 6 represent the repair welding districts, 7 expression repair welding district welding beads.
The inventor etc. further discuss the optimum condition in repair welding district by various tests, the result shows: the zone that stops by the brittle crack with respect to the butt joint of the possibility that makes the crack propagation that enbrittles, form the repair welding district 6 of above-mentioned tenacity excellent, make simultaneously repair welding district 6 the outer rim direction angle Φ with respect to welding zone 5 vertically be 10 the degree～60 the degree, thus, just can make a side who transfers to steel plate 1 side or timber 3 sides along the brittle crack that the heat affected area of welding zone 5 or steel plate 1 is propagated, in the steel plate mother metal, stop to propagate, in addition, even enter repair welding district 6, also can in repair welding district 6, stop reliably propagating.
The starting point of the technology of the present invention thought is, make since the periphery of repair welding district 6 outer rims, be the zone generation that is connected with repair welding district 6 of butt joint 2 residual stress influence and along a side who the brittle crack of the longitudinal propagation of welding zone 5 is transferred to steel plate 1 side or timber 3 sides from the heat affected area to welding zone 5 or steel plate 1 of butt joint 2.
The inventor makes with respect to the angle Φ to the outer rim direction in the district of repair welding longitudinally 6 of welding zone 5 and changes, thereby has studied the condition that can make the brittle crack of propagating in the heat affected area to welding zone 5 or steel plate 1 of butt joint 2 transfer to a side of steel plate 1 side or timber 3 sides.
Its result as can be known, because when above-mentioned angle Φ spends above 60, in most cases, brittle crack enters in the repair welding district 6, so if the fracture toughness in repair welding district 6 is insufficient high, brittle crack is stopped, but, if Φ is lower than 60 degree, brittle crack just can be propagated along the boundary portion of repair welding district 6 and butt joint (mother metal), imports in steel plate 1 or the timber 3 and stops propagation.
In addition, in order to bring into play this effect more fully, preferably will be made as 45 degree or below it with respect to angle Φ to the outer rim direction in the district of repair welding longitudinally 6 of welding zone 5.
But above-mentioned angle Φ is lower than 10 when spending, though brittle crack is propagated along the boundary portion of repair welding district 6 and butt joint 2 (mother metal), because at the periphery of the position in the zone of leaving repair welding district 6, the position of brittle-cracking propagation is with too near to the distance of welding zone 5, so sometimes brittle crack can be once more along the heat affected area of welding zone 5 or steel plate 1 is propagated again, thereby the lower limit of above-mentioned Φ is made as 10 degree.
Find in addition, by the longitudinally angle θ of control with respect to the repair welding welding bead 7 of final at least floor in the district of repair welding longitudinally 6 in above-mentioned repair welding district 5, make and in the zone that repair welding district 6 is connected with butt joint (heat affected area of steel plate 1), produce bigger residual stress, the principal direction of stress that this is regional changes on the direction different with the principal direction of stress that acts on butt joint 2 (to the heat affected area of welding zone 5 and steel plate 1), thereby the brittle crack of propagating along the heat affected area to welding zone 5 or steel plate 1 of above-mentioned butt joint 2 is shifted from this heat affected area to welding zone 5 or steel plate 1, lead to mother metal portion.
That is to say, the inventor finds by carrying out various tests, the residual stress that the zone produced that is connected of repair welding district 6 and butt joint 2 is subjected in the repair welding district 6 repair welding welding bead 7 vertical very big with respect to the influence to the θ of angle longitudinally of welding zone 5 of final at least floor.
When repair welding welding bead 7 solidifies, that particularly welds welding bead carries out bigger contraction once the side longitudinally, but because the matrix of the butt joint (heat affected area of steel plate 1) of repair welding welding bead 7 end periphery is difficult to distortion, thus its result, in the end periphery generation residual stress of repair welding welding bead 7.
In addition, under the bigger situation of the thickness of repair welding welding bead 6, carry out the repair welding of multilayer multiple tracks, but because the repair welding welding bead 7 of final layer can be by one deck layer heating down, so will keep its former state in the residual stress that end periphery produced of the repair welding welding bead 7 of final layer.
Therefore can know, owing to produce bigger residual stress, so in the welding bead of the final at least floor in repair welding district 6, be very important with respect to the θ of angle longitudinally to the welding bead of repair welding longitudinally 7 of welding zone 5 at the join domain of repair welding district 6 and butt joint 2.
When above-mentioned angle θ spends above 80, since repair welding welding bead 7 vertically near with direction to vertical quadrature of welding zone 5, the stretching residual stress that is produced during the welding bead solidification shrinkage is consistent or approaching with the principal direction of stress that is used for propagating crack, so can't make the periphery of transferring to the repair welding district along the brittle crack that the melt run (FL) of welding zone 5 is propagated.
Therefore, preferably in the welding bead of the final at least floor in repair welding district 6, will be made as 80 with respect to θ longitudinally and spend or below it the welding bead of repair welding longitudinally 7 of welding zone 5.
In addition, along with above-mentioned θ approaches 0 degree, the direction quadrature of the residual stress of the draw direction that the end produced of the direction of the principal stress of propagating crack and repair welding welding bead 7, because the direction of this combined stress has the effect that stops the crackle straight ahead, therefore the effect that makes crackle transfer to the periphery in repair welding district increases, thereby preferred.
And then, for by repair welding welding bead 7 is carried out welding procedure in repair welding district 6 repair welding produce big as far as possible residual stress, more preferably keep temperature difference with the neighboring area of repair welding welding bead 7.
Under the situation that weld heat input is bigger when repair welding, the temperature of peripheral part of repair welding welding bead 7 rises also bigger, and the time that repair welding welding bead 7 is cooled to about room temperature is also longer, and residual stress will diminish, thereby in order to improve residual stress, heat input is more little favourable more.
(embodiment)
Eliminate the part of butt joint by gouge, this part is implemented repair welding, whether can bring into play the performance of the propagation that stops brittle crack at this repair welding district and carry out various tests.
In test, whether can stop the brittle crack of edge in order to estimate to vertical straight ahead of welding zone, as shown in Figure 4, steel plate with 2500mm * 2500mm * thickness of slab, on this test film surface, 8 places of the central portion at the back side respectively machining to go out the degree of depth be about 1/2 of thickness of slab, surface at test film, diameter on the back side is " pit " such with the size of thickness of slab same degree, wherein make the welding material of the various chemical compositions shown in table 1～4, welding condition changes, the test film that the tissue of the chemical composition of weld metal and weld metal changes thereby making is sent as an envoy to.
And, with with the corresponding to mode of Fusion Line (melt run) to welding zone (the large-line energy welding point that obtains by electrogas arc welding), the V word breach processing that produces brittle crack implementing to be used to insert chock 8 apart from the position of this test film end 200mm, and the test film end is cooled to low temperature about-40 ℃, the central portion of test film is controlled to be-10 ℃, thereby the stress of load regulation, then chock is squeezed into V word notch part, produce brittle crack, and brittle crack is propagated along the melt run to welding zone.
After the brittle crack of propagating arrives the repair welding district, whether this brittle crack propagated estimate.
This result of the test is shown in table 1.
In addition, mensuration to the toughness of welding zone and repair welding district weld metal is separately carried out as following, promptly, so that vertically being made as with the mode to the vertical vertical direction of welding zone of test film taked test film respectively, implement the v-notch Charpy-type test for separately test film, obtain fragility-ductile fracture transition temperature vTrs (℃).Repair welding district shown in the table 1 and to the vTrs of welding zone (℃) the difference expression according to such each vTrs that measures (℃) poor.
In addition, the mensuration of the residual stress of repair welding district periphery is carried out as following, promptly, in the welded unit side, the position that is connected with outer edge separately to welding zone in distance repair welding district (the Charpy test piece collection position 11 of Fig. 3: ● seal) only on the position of 2mm, measure permanent set with x-ray method.
The stress direction of the residual stress after the mensuration is and vertical vertical direction to welding zone the principal direction of stress that is brittle crack when the heat affected area of welding zone or steel plate is propagated.
Residual stress (Mpa) expression in the repair welding district of table 1 is according to the residual stress of such mensuration, symbol-expression compression stress ,+expression tensile stress.
The propagation position that cracking resistance line shown in the table 1 is propagated, be meant the crack propagation position of crackle when the repair welding district propagates that is produced in the test film end, FL (Fusion Line) expression crackle is propagated along the melt run (FL) in repair welding district, and WM is illustrated in the weld metal in repair welding district and propagates.
In addition, in the propagated result of the cracking resistance line shown in the table 1, so-called " be transferred to mother metal and stop ", the expression crackle is transferred to the outside in repair welding zone, stops in soldered mother metal, not fracture.So-called " propagate after entering WM, welding zone is being propagated again " after the expression crackle enters in the repair welding zone, connects propagation at the repair welding intra-zone, continues welding zone is being propagated and the result of fracture again.
So-called " after the periphery propagation of repair welding district, welding zone being propagated " though expression can be directed to crackle repair welding district periphery, can not be transferred to mother metal, after propagate the repair welding area, again along the result that welding zone is propagated again.
So-called " (stopping) " but a part of crackle also is branched off into the repair welding district, though being meant main crackle is transferred to mother metal and stops, but since repair welding district and can not fully compress to the residual stress of the intersection region of welding zone, the crackle branch in therefore propagating, thus also enter the repair welding district.But, because main crackle is transferred to mother metal, so though part damage in repair welding district can not reach fracture.
No.1～No.13 removes the part of butt joint and the example of the present invention of carrying out repair welding according to the present invention, any one embodiment, and its cracking resistance line is propagated all to be good.
Because the value of No.11,12,13 above-mentioned angle θ is excessive, so residual stress does not reach the value of regulation.Therefore, the part of crackle is branched off into the repair welding district, but because main crackle is transferred to mother metal, so be stopped.
On the other hand, No.14～No.21 is a comparative example, No.14～No.17 removes the part of butt joint and carries out repair welding, but because repair welding district and toughness insufficient to the poor toughness of welding zone, the repair welding district are lower, so crackle enters the repair welding district, in this zone with stopping not connecting the repair welding district, again along welding zone being propagated and being ruptured thereafter.
Though the toughness in the repair welding district of No.18 is abundant because Φ value is too little, so crackle along the periphery propagation of repair welding district, and then propagation and rupturing in to welding zone.
In addition, do not remove the part in butt joint district owing to No.19～No.21 and carry out repair welding, so the brittle crack that the butt joint place produces is propagated along this welding point, test film really is fractured into two.
Table 1
| No. | Butt joint | Repair welding | ||||||||||||||
| Steel grade | Thickness of slab (mm) | Welding method | Welding material | Remove method | Wide W (mm) | Long L (mm) | Total depth (mm) | Welding method | Welding material | The vTrs's of repair welding and butt welding is poor | Angle φ (degree) | Angle θ (degree) | Implemented the layer of θ angle control | Heat input (kJ/mm) | ||
| Example of the present invention | 1 | YP40 | 50 | EG | EG-1 | Gouge | 115 | 138 | 40 | CO 2Welding | YM55H | -20 | 12 | 0 | All layers | 2.5 |
| 2 | YP47 | 45 | EG | EG-60 | Machining | 80 | 96 | 25 | SMAW | N-12 | -32 | 43 | 60 | Final layer | 2 | |
| 3 | YP32 | 35 | EG | EG-1 | Gouge | 70 | 84 | 35 | CO 2Welding | YM-3N | -40 | 15 | 45 | Final layer | 2.5 | |
| 4 | YP36 | 25 | EG | EG-3 | Gouge | 60 | 72 | 20 | CO 2Welding | YM-1N | -30 | 20 | 35 | All layers | 3 | |
| 5 | YP40 | 50 | EG | EG-3 | Machining | 115 | 138 | 25 | SMAW | YAWATA WELD B | -150 | 30 | 55 | All layers | 2.5 | |
| 6 | YP40 | 60 | EG | EG-3 | Gouge | 140 | 168 | 40 | CO 2Welding | YM36E | -25 | 45 | 45 | All layers | 5 | |
| 7 | YP40 | 35 | CO2 | YM26 | Gouge | 80 | 96 | 20 | CO 2Welding | YM55H | -28 | 10 | 45 | Final layer and close 3 layers with it | 2 | |
| 8 | YP47 | 70 | VEGA-II | EG-60M | Machining | 150 | 180 | 50 | SMAW | YAWATA WELD B(M) | -180 | 35 | 40 | Final layer and close 4 layers with it | 2.9 | |
| 9 | YP32 | 40 | SAW | Y-Dx NB250H | Gouge | 90 | 108 | 25 | CO 2Welding | YM309L | -160 | 42 | 30 | Final layer | 5 | |
| 10 | YP40 | 80 | VEGA-II | EG-60M | Gouge | 150 | 180 | 50 | CO 2Welding | YM309L | -100 | 55 | 45 | All layers | - | |
| 11 | YP36 | 20 | FAB | Y-Dx NB250H | Gouge | 50 | 60 | 10 | CO 2Welding | YM316L | -140 | 40 | 85 | Final layer | 2.8 | |
| 12 | YP40 | 45 | SAW | Y-DMx NSH55E | Machining | 100 | 120 | 35 | SMAW | YAWATA WELD B(M) | -175 | 45 | 82 | Final layer | 2.3 | |
| 13 | YP47 | 100 | VEGA-II | EG-60M | Gouge | 200 | 240 | 80 | SMAW | YM-3N | -45 | 60 | 90 | All layers | - | |
| Comparative example | 14 | YP40 | 50 | EG | EG-3 | Gouge | 90 | 100 | 30 | CO 2Welding | YM28 | -10 | 0 | 30 | Final layer | 3.5 |
| 15 | YP47 | 30 | FCB | Y-DMx NSH55E | Gouge | 70 | 100 | 20 | SMAW | L-60 | 40 | 45 | 90 | All layers | 3.5 | |
| 16 | YP32 | 45 | EG | EG-1 | Machining | 90 | 100 | 25 | CO 2Welding | YM28 | -5 | 80 | 45 | All layers | 1.5 | |
| 17 | YP47 | 31 | FCB | Y-DMx NSH55E | Gouge | 70 | 100 | 20 | SMAW | L-60 | 5 | 40 | 30 | All layers | 2.1 | |
| 18 | YP40 | 25 | FCB | Y-DMx NSH55E | Machining | 100 | 90 | 25 | CO 2Welding | YM28 | -25 | 5 | 80 | Final layer | 2.3 | |
| 19 | YP36 | 65 | VEGA | EG-60M | Do not have | - | - | 0 | - | Do not have | - | |||||
| 20 | YP40 | 70 | SEG | DWS-1LG | Do not have | - | - | 0 | - | Do not have | - | |||||
| 21 | YP40 | 60 | VEGA-II | EG-60M | Do not have | - | - | 0 | - | Do not have | - | |||||
Wherein, the EG in the table: electrogas arc welding, CO
2: shield carbon-dioxide arc welding, SAW: submerged-arc welding, the submerged-arc welding of FCB:Cu liner single face,
FAB: the submerged-arc welding of asbestos lining single face, VEGA: the electrogas arc welding of monofilament swing type, VEGA-II: the electrogas arc welding of mariages swing type,
SEG: plain type electrogas arc welding, SMAW: manual welding (SMAW)
Table 1 (continuing)
| No. | The cracking resistance line is propagated | |||
| The residual stress in repair welding district | The propagation position in repair welding district | The result | ||
| 1 | -350 | FL | Be transferred to mother metal and stop | |
| 2 | -402 | FL | Be transferred to mother metal and stop | |
| 3 | -265 | FL | Be transferred to mother metal and stop | |
| 4 | -300 | FL | Be transferred to mother metal and stop | |
| 5 | -340 | FL | Be transferred to mother metal and stop | |
| 6 | -300 | FL | Be transferred to mother metal and stop | |
| 7 | -320 | FL | Be transferred to mother metal and stop | |
| 8 | -420 | FL | Be transferred to mother metal and stop | |
| 9 | -300 | FL | Be transferred to mother metal and stop | |
| 10 | -200 | FL | Be transferred to mother metal and stop | |
| 11 | 100 | FL(WM) | Be transferred to mother metal and stop (stopping) but a part of crackle also is branched off into the repair welding district | |
| 12 | 120 | FL(WM) | Be transferred to mother metal and stop (stopping) but a part of crackle also is branched off into the repair welding district | |
| 13 | 300 | FL(WM) | Be transferred to mother metal and stop (stopping) but a part of crackle also is branched off into the repair welding district | |
| 14 | 100 | WM | After the periphery propagation of repair welding district, again welding zone is being propagated | |
| 15 | -200 | WM | Propagate after entering WM, again welding zone is being propagated | |
| 16 | 300 | WM | Propagate after entering WM, again welding zone is being propagated | |
| 17 | -250 | WM | Propagate after entering WM, again welding zone is being propagated | |
| 18 | 120 | WM | After the periphery propagation of repair welding district, again welding zone is being propagated | |
| 19 | - | - | Welding zone is being propagated | |
| 20 | - | - | Welding zone is being propagated | |
| 21 | - | - | Welding zone is being propagated | |
Table 2 chemical composition of steel (quality %)
| Steel grade | C | Si | Mn | P | S | Ni | Ti |
| YP32 | 0.13 | 0.19 | 1.28 | 0.01 | 0.003 | - | 0.01 |
| YP36 | 0.12 | 0.21 | 1.27 | 0.007 | 0.004 | - | 0.01 |
| YP40 | 0.11 | 0.21 | 1.3 | 0.006 | 0.003 | - | 0.01 |
| YP47 | 0.08 | 0.24 | 1.22 | 0.007 | 0.002 | 1.02 | 0.01 |
The chemical composition (quality %) of the welding material of table 3 pair welding zone
| Welding material | C | Si | Mn | P | S | Mo | Ni |
| EG-1 | 0.1 | 0.33 | 1.45 | 0.015 | 0.01 | 0.27 | - |
| EG-3 | 0.08 | 0.29 | 1.85 | 0.011 | 0.008 | 0.2 | - |
| EG-60 | 0.1 | 0.34 | 1.68 | 0.016 | 0.015 | 0.29 | - |
| EG-60M | 0.07 | 0.29 | 1.81 | 0.011 | 0.01 | 0.4 | 1.5 |
| YM26 | 0.1 | 0.52 | 1.11 | 0.017 | 0.011 | - | - |
| Y-Dx NB250H | 0.07 | 0.24 | 1.38 | 0.014 | 0.009 | - | - |
| Y-DMx NSH55E | 0.1 | 0.25 | 1.40 | 0.014 | 0.009 | 0.36 | - |
| DWS-1LG | 0.06 | 0.20 | 1.51 | 0.015 | 0.01 | - | 2.0 |
The chemical composition (quality %) of the welding material in table 4 repair welding district
| Welding material | C | Si | Mn | P | S | Mo | Ni | Cr |
| YM36E | 0.05 | 0.33 | 1.2 | 0.004 | 0.002 | - | - | - |
| YM55H | 0.08 | 0.44 | 1.36 | 0.006 | 0.002 | 0.18 | - | - |
| YM60C | 0.07 | 0.38 | 1.38 | 0.005 | 0.012 | 0.35 | - | - |
| YM-1N | 0.05 | 0.39 | 1.25 | 0.007 | 0.005 | 0.22 | 0.98 | - |
| YM-3N | 0.04 | 0.3 | 0.7 | 0.006 | 0.004 | - | 3.56 | - |
| YAWATA WELD B | 0.06 | 0.3 | 2.91 | 0.008 | 0.004 | 0.76 | 68.5 | 16.7 |
| YAWATA WELD B(M) | 0.09 | 0.24 | 3.27 | 0.008 | 0.003 | 2.32 | 65.1 | 15 |
| YM309L | 0.022 | 0.47 | 1.52 | 0.02 | 0.007 | - | 13.1 | 24.1 |
| YM316L | 0.015 | 0.49 | 1.32 | 0.02 | 0.007 | 2.59 | 12.8 | 18.9 |
| N-12 | 0.06 | 0.44 | 1.02 | 0.002 | 0.005 | - | 2.38 | - |
| N-13 | 0.05 | 0.42 | 0.46 | 0.01 | 0.008 | - | 3.35 | - |
| N-16 | 0.04 | 0.17 | 0.28 | 0.01 | 0.05 | - | 6.65 | - |
| L-60 | 0.07 | 0.48 | 1.12 | 0.01 | 0.06 | 0.22 | 0.76 | - |
In a single day as mentioned above,, carry out specific repair welding, even when on welding point, producing brittle crack, also can prevent the propagation of brittle crack with the weld zone by a part to butt joint according to the present invention.
And the present invention can provide the welding method of the welding structural body of the fatal fracture that can prevent welding structural body, can bring into play useful significant effect industrial.
Claims (12)
1. the welding method of the welding structural body of an anti-brittle-cracking propagation excellence, the welding method of this welding structural body can stop the propagation of the brittle crack that the welding point place produces, and it is characterized in that:
In the butt joint of the possibility of the crack propagation that enbrittles, for the zone that brittle crack is stopped, remove the part of this regional butt joint with gouge or machining, afterwards, by this part of repair welding, form and to have the high toughness of comparison welding zone and be the repair welding districts of 10 degree～60 degree with respect to angle Φ to the direction of outer rim longitudinally of welding zone.
2. the welding method of the welding structural body of anti-brittle-cracking propagation excellence according to claim 1 is characterized in that, the toughness in above-mentioned repair welding district is compared with fragility-ductile fracture face transition temperature vTrs to welding zone, and is low at least 20 ℃ or more than it.
3. according to the welding method of the welding structural body of claim 1 or 2 described anti-brittle-cracking propagation excellences, it is characterized in that, above-mentioned repair welding, by any one party or two sides for the surface and the back side of butt joint, gouge or machining are removed after 1/2 or its above scope of thickness of slab, and this part is carried out repair welding.
4. according to the welding method of the welding structural body of any described anti-brittle-cracking propagation excellence of claim 1～3, it is characterized in that, in the join domain of above-mentioned repair welding district and butt joint, with to the vertical vertical direction of welding zone on produce 1/2 or the compressive residual stress more than it of the yield stress YP of soldered member.
5. according to the welding method of the welding structural body of any described anti-brittle-cracking propagation excellence of claim 1～4, it is characterized in that, in the repair welding welding bead of the final at least floor in above-mentioned repair welding district, to be controlled to be 80 degree with respect to the θ of angle longitudinally or below it, thereby implement repair welding the welding bead of repair welding longitudinally of welding zone.
6. according to the welding method of the welding structural body of any described anti-brittle-cracking propagation excellence of claim 1～5, it is characterized in that, to be controlled to be 10 degree～45 degree with respect to the angle Φ of the outer rim direction in the above-mentioned district of repair welding longitudinally to welding zone, thereby implement repair welding.
7. the welding structural body of an anti-brittle-cracking propagation excellence, the brittle-cracking propagation that this welding structural body stops welding point to produce is characterized in that:
In the butt joint of the possibility of the crack propagation that enbrittles, in the zone that brittle crack is stopped, having with welding zone is compared and have high toughness and be the repair welding districts of 10 degree～60 degree with respect to angle Φ to the direction of outer rim longitudinally of welding zone.
8. the welding structural body of anti-brittle-cracking propagation excellence according to claim 7 is characterized in that, the toughness in above-mentioned repair welding district is compared with fragility-ductile fracture face transition temperature vTrs to welding zone, and is low at least 20 ℃ or more than it.
9. according to the welding structural body of claim 7 or 8 described anti-brittle-cracking propagation excellences, it is characterized in that above-mentioned repair welding district is on any one party or two sides at the surface of butt joint and the back side, according to 1/2 or scope more than it of thickness of slab and have.
10. according to the welding structural body of any described anti-brittle-cracking propagation excellence of claim 7～9, it is characterized in that, in the join domain of above-mentioned repair welding district and butt joint, with vertical vertical direction to welding zone on have 1/2 or the compressive residual stress more than it of the yield stress YP of soldered member.
11. welding structural body according to any described anti-brittle-cracking propagation excellence of claim 7～10, it is characterized in that, in the repair welding welding bead of the final at least floor in above-mentioned repair welding district, be 80 to spend or below it with respect to the θ of angle longitudinally to the welding bead of repair welding longitudinally of welding zone.
12. the welding structural body according to any described anti-brittle-cracking propagation excellence of claim 7～11 is characterized in that, is 10 degree～45 degree with respect to the angle Φ of the outer rim direction in the above-mentioned district of repair welding longitudinally to welding zone.
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| CN100453236C (en) * | 2006-12-20 | 2009-01-21 | 中国电子科技集团公司第十四研究所 | Micro-area Repair Welding Method for Aluminum Alloy Defects |
| CN102271861A (en) * | 2009-01-14 | 2011-12-07 | 新日本制铁株式会社 | Weld structure having brittle fracture arresting characterstics |
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