CN109520858A - A method of examining oblique Y type groove weld crack - Google Patents
A method of examining oblique Y type groove weld crack Download PDFInfo
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- CN109520858A CN109520858A CN201811319359.XA CN201811319359A CN109520858A CN 109520858 A CN109520858 A CN 109520858A CN 201811319359 A CN201811319359 A CN 201811319359A CN 109520858 A CN109520858 A CN 109520858A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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Abstract
The present invention relates to a kind of method for examining oblique Y type groove weld crack, step includes 1. selecting suitable wlding；2. optimizing retaining wall on slope pattern；3. preweld cleaning；4. test specimen splices；Weld seam is restrained 5. welding；6. pilot seam weld preheating；7. soldering test weld seam；8. after welding treatment；9. weld seam colours；10. crackle is evaluated；Step 2. in, first prepare sample 1 and 2, the assembling structure of sample 1: wedge surface that is symmetrical above and below, being mutually in pinnacle, the assembling structure of sample 2: both sides are wedge surface that is symmetrical above and below, being mutually in pinnacle, centre is the slope surface extended up and down, and the wedge surface entirety bodily sinkage that slope surface is relatively above, the depth of sinking and the oblique Y root gap of the postwelding of standard requirements are consistent.It is broken or curved disconnected method in addition, the application directlys adopt coloring, more intuitively measures face crack rate, root cracks rate and section crack rate.
Description
Technical field
The invention belongs to weld crack field, the welding electrode arc welding for being suitable for (but being not limited to) carbon steel and low alloy steel is gentle
Body protection weldering welding point cool attenuation is examined and research.
Background technique
" cold crack of the destructive testing weldment of metal material weld seam tests arc-welding to standard GB/T/T32260.2-2015
Method part 2: from lock test " and shipbuilding industry standard CB/T4364-2013 " oblique Y type groove welding crack test method "
The equal butt welding of the standard Y root gap that retreads is strict with；Wherein standard GB/T/T32260.2-2015 " metal material
The cold crack of the destructive testing weldment of weld seam tests arc welding method part 2: from lock test " it requires between the oblique root Y of postwelding
2.0 ± 0.2mm of gap；Standard requirements are more by shipbuilding industry standard CB/T4364-2013 " oblique Y type groove welding crack test method "
Strictly, welding electrode arc welding are as follows: 2.0 ± 0.2mm；Gas shielded arc welding are as follows: 1.0 ± 0.2mm.
Currently, two standards are primarily present following problem: 1) existing groove type is high to welder's skill requirement, Han Gongzhu
Root gap is controlled and adjusted by experience, gap between two ends situation not of uniform size and size over-standard phenomenon often occurred, done over again
Probability is high.2) standard does not require contained weld seam welding process, but welding process also will affect oblique Y root gap；Wherein
Major influence factors are welding sequences, are needed using reasonable welding sequence, and weld contraction deforms after just can be effectively controlled welding,
Reduce the influence that weld contraction controls oblique Y root gap；3) the calculating error of cracking breakout is larger；National standard GB/T32260.2-
Face crack rate and root cracks rate simple computation are only defined in 2015, face crack rate is measured using method for visual inspection；
Root cracks rate is measured using profile method, and even weld is cut into 4 parts using fusion length direction by profile method, respectively
Detect the cracking breakout situation on cut surface.Specific such as Fig. 1 and Fig. 2.Shipbuilding industry standard CB/T4364-2013 is relatively stringent, increases
The calculation method of section crack rate is added.In the above several method for calculating cracking breakout, using visual and profile survey surface
There is biggish error in cracking breakout and root cracks rate calculating.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of the welding of oblique Y type groove to be examined to split for the above-mentioned prior art
Line reliable method improves the deficiency that existing national standard is examined, and by changing groove type, reduces the exceeded wind of groove root gap size
Danger, greatly promotes test efficiency and success of the test rate；Reduce oblique Y root gap error caused by artifact；Not conducive to guarantee
The welder of same level can weld the oblique Y root gap of standard requirements.
In addition, improving the accuracy of cracking breakout measurement result, weld seam is segmented profile method in the application rejection criteria, avoids cuing open
Face method causes the mistake of measurement data or the larger situation of error；It directlys adopt coloring to break or curved disconnected method, more intuitively measure
Face crack rate, root cracks rate and section crack rate.
The specific technical solution of the present invention are as follows: a method of oblique Y type groove weld crack is examined, step includes 1. selecting
Select suitable wlding；2. optimizing retaining wall on slope pattern；3. preweld cleaning；4. test specimen splices；Weld seam is restrained 5. welding；6. test weldering
Stitch weld preheating；7. soldering test weld seam；8. after welding treatment；9. weld seam colours；10. crackle is evaluated；
Wherein, the wlding of step 1. uses the wlding to match with base material, and welding rod should dry；
Step 2. in, to sample 1 and 2 process, the assembling structure of sample 1: it is symmetrical above and below, mutually be in pinnacle wedge surface, sample 2
Assembling structure: both sides are wedge surface that is symmetrical above and below, being mutually in pinnacle, and centre is the slope surface that extends up and down, and slope surface is relatively above
Wedge surface entirety bodily sinkage, the depth of sinking and standard GB/T/T32260.2-2015 " destructiveness of metal material weld seam
The cold crack for testing weldment tests arc welding method part 2: from lock test " and shipbuilding industry standard CB/T4364-2013 is " tiltedly
Y type groove welding crack test method " require the oblique Y root gap of postwelding it is consistent；
Step 4. in, sample 1 and sample 2 are assembled, makes opposite wedge surface and constitutes contained weld seam, the phase on both sides between wedge surface
Pair wedge surface and slope surface between constitute intermediate pilot seam.
Step 4. in, splicing is completed into the docking contact of the wedge surface pinnacles of the two sides of sample 1 and 2, after splicing is good, using clearance gauge
It is inserted into root along slope surface, whether measurement root gap can be within the scope of standard requirements.Gas shield welding is controlled in 1.0 ± 0.2mm；
Manual electric arc welding is controlled in 2.0 ± 0.2mm.In GB/T32260.2-2015 and CB/T4364-2013 method, by welder's experience
Certain interval is reserved at the double V root faces in both ends pilot seam region, needs experienced welder to adjust repeatedly, this gap
Size not can guarantee oblique Y root gap within the scope of standard requirements；This method is by two test specimen docking contacts, without appointing
What adjustment can carry out the welding of contained weld seam.
The operation of step 3. is the moisture, greasy dirt and dust for removing the specimen surface processed before welding, it is accordingly required in particular to
Guarantee test weld seam corresponds to groove cleaning.
5. step restrains the welding of weld seam: restraining weld seam is V-type symmetrical above and below, and contained weld seam is divided by when welding
Left, upper right, lower left and four positions of lower right, welding sequence are upper left → upper right → lower left side → lower right, each welding symmetrical above and below
A time is recycled with this until welding full entire weld seam.Pay attention to must assure that continuous welding, do not allow to stop among welding process,
Until all contained weld seam welderings are full.
6. step is that small iron grinds preheating sensitive temperature in order to obtain, need to carry out different temperatures test to sample；It is pre- before weldering
Hot temperature is using 170 DEG C, 150 DEG C, 130 DEG C, 110 DEG C four different preheating temperature tests.Heating is added using box type heater
Heat, the TES1300 contact thermocouple thermometric produced using Taiwan measure temperature range: (- 50~1300) DEG C；
Measurement accuracy :-accuracy ± (0.3%+1 DEG C)；It can guarantee temperature measurement accuracy.
Preferably, step 7. soldering test weld seam when according to etc. strong matching principle, the welding rod of selection should match with base material,
Welding rod used answers strict drying.
8. after welding treatment is to place 72h at room temperature after the completion of welding to step.
Preferably, 9. weld seam coloring is to be heated sample using flame gun to step, and sample is heated to 500 DEG C~600 DEG C,
Crack surface is set sufficiently to turn blue；Crackle face color and other fractures in this way at coloring just have obvious differentiation, and are not easy to fade, just
In observation, and the accuracy of crackle is higher.
In order to guarantee measure cracking breakout reliability, the application step 10. crackle evaluate: standard GB/T/
" cold crack of the destructive testing weldment of metal material weld seam tests arc welding method part 2 to T32260.2-2015: restraining certainly
Test " and shipbuilding industry mark CB/T4364-2013 " oblique Y type groove welding crack test method " Standard Judgement on the basis of, whole
Fracture upper surface cracking breakout, root cracks rate and section crack rate are detected using curved disconnected mode, reduce band in other evaluation methods
The error come.Concrete operations are to be removed contained weld seam with sawing machine, and curved break of sample is then made 1 He of sample on Apparatus for Bending at low-temp
Sample 2 judges cracking breakout from commissure dialysis from section.
Compared with the prior art, the advantages of the present invention are as follows: oblique Y type groove weld crack is examined the invention proposes a kind of
Reliable method is that " cold crack of the destructive testing weldment of metal material weld seam tests arc in national standard GB/T32260.2-2015
Soldering method part 2: from lock test " and " the oblique Y type groove welding crack test side shipbuilding industry standard CB/T4364-2013
Method " the optimization innovation that carries out in standard base:
1) tiltedly the control in Y groove root gap is the key link in oblique Y groove crack-sensitivity test method, its control
Quality directly influences the accuracy of experimental result；Optimize retaining wall on slope pattern, the welder conducive to guarantee different level can weld
The oblique Y root gap of standard requirements out, although changing groove type, experimental result is unaffected, more can accurately react steel
Plate welding crack sensibility；
2) success rate of oblique Y type groove welding crack test working efficiency and test is substantially improved, it is reasonable by designing
Groove type reduces groove size risk of exceeding criterion, greatly improves test efficiency and success of the test rate；
3) oblique Y root gap error caused by artifact is significantly reduced；Conducive to the equal energy of welder for guaranteeing different level
Weld the oblique Y root gap of standard requirements；
4) cracking breakout measurement result is more acurrate, and this method suggests that weld seam is segmented profile method in rejection criteria, avoids section
Method causes the mistake of measurement data or the larger situation of error；It directlys adopt coloring to break or curved disconnected method, more intuitively measures table
Face cracking breakout, root cracks rate and section crack rate.
Detailed description of the invention
Fig. 1 is the schematic diagram for detecting manual welding sample root cracks rate in standard using segmentation profile method；
Fig. 2 is in standard using the schematic diagram of segmentation section hair detection automatic welding sample root cracks rate；
Fig. 3 is the structural schematic diagram of oblique Y type groove welding crack detection sample before optimization；
Fig. 4 is A-A cross-sectional view in Fig. 3；
Fig. 5 is B-B cross-sectional view in Fig. 3；
Fig. 6 is the structural schematic diagram of the oblique Y type groove welding crack detection sample after the application optimization；
Fig. 7 is A-A cross-sectional view in Fig. 6；
Fig. 8 is B-B cross-sectional view in Fig. 6；
Fig. 9 is the structural schematic diagram of sample 1 in embodiment；
Figure 10 is the structural schematic diagram of sample 2 in embodiment；
Figure 11 is the spliced structural schematic diagram of sample 1 and 2 in embodiment；
Figure 12 is in embodiment to judge cracking breakout for the curved schematic diagram having no progeny of sample.
Fig. 1,1 metal lographic examination dissection cut direction is represented as along width direction in 2；2 corresponding profile positions.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
The present embodiment is with NM500 wear-resisting steel plate, and % is calculated as C:0.20~0.30 to chemical component by mass percentage；Si:
0.20~0.40；Mn:0.60~0.80；P≤0.012；S≤0.003；Cr:0.60~0.90；Ni≤0.30；Cu≤ 0.30；
Mo:0.10~0.30；Remaining is Fe, thickness of steel pipe 30mm.The present embodiment examines the oblique Y type groove welding of NM500 wear-resisting steel plate
Crackle reliable method test procedure is as follows:
1, suitable wlding is selected
It tests welding material used and uses the import Lincoln's wlding to match with base material, gas shield welding is the LA- of φ 1.2mm
100, Manual electric welding item is the 11018MMR of φ 4.0mm；It strictly to be dried before welding electrode.
2, optimize retaining wall on slope pattern, as shown in figs. 9-10,
After surface of steel plate scale removal, sample overall dimensions according to GB/T32260.2-2015 " metal material weld seam
The cold crack of destructive testing weldment tests arc welding method part 2: from lock test " and shipbuilding industry standard CB/T4364-
2013 " oblique Y type groove welding crack test method " standard requirements sizes are processed.Test plate (panel) length is 200mm after docking, wide
Degree is 150mm；It is specific as shown in Figure 2；Groove size is optimized on the basis of original, such as Fig. 3, the groove of sample 1
Form is consistent with standard requirements, and 2 groove type of sample is optimized, corresponding pilot seam groove position output depth with
The consistent slot of the oblique Y root gap of standard requirements, after the completion of can guarantee contained weld seam welding, pilot seam corresponds to oblique Y root gap and exists
In standard requirements size range, wherein gas shield welding control range: 1.0 ± 0.2mm；Manual electric arc welding control range: 2.0 ±
0.2mm。
3, preweld cleaning
Before welding, preweld cleaning should be carried out to the sample processed, moisture, greasy dirt and dust is avoided to stay in sample table
Face, it is accordingly required in particular to which guarantee test weld seam corresponds to groove cleaning.
4, sample splices
It according to standard requirements, by process two pieces of samples and is put in welding platform, need to guarantee that welding platform is smooth flat
It is whole, and be stitched together, as shown in figure 11, the oblique root Y is inserted into using clearance gauge, measures root gap
5, it welds and restrains weld seam；
5.1 contained weld seam welding conditions
It is as follows to restrain weld seam welding parameter:
Table 1 is to restrain weld seam welding parameter
It restrains weld seam welding and is not necessarily to weld preheating, using 1.2 Atlantic Ocean gas shield welding wire of φ, trade mark CHW50C6, welding ginseng
Number as shown above, adjusts suitable welding, and parameter heat input should be controlled in (12~15) KJ/cm；Heat input be not easy it is excessive, with
Exempt to cause weld contraction stress excessive, is not easy to control oblique Y root gap size.
5.2 contained weld seam welding sequences
Weld seam welding sequence is restrained to be provided, we by contained weld seam it is artificial be divided into a upper left, upper right, lower left side and under
Right four positions, welding sequence are that upper left → upper right → lower left side → lower right circulation diagonal line sequentially welds, and weld a time every time,
Welding process must not pause, and be recycled with this until the full entire weld seam of weldering, pays attention to must assure that continuous welding, centre does not allow to stop
It stays, until all contained weld seam welderings are full.
6, pilot seam weld preheating；
Small iron grinds preheating sensitive temperature in order to obtain, needs to carry out different temperatures test to sample；Weld preheating temperature is adopted
With 170 DEG C, 150 DEG C, 130 DEG C, 110 DEG C four different preheating temperature tests.Heating is heated using box type heater, is used
The TES1300 contact thermocouple thermometric of Taiwan production, measures temperature range: (- 50~1300) DEG C；Measurement essence
Degree :-accuracy ± (0.3%+1 DEG C)；It can guarantee temperature measurement accuracy.
7, soldering test weld seam；
The selection of 7.1 wldings
According to etc. strong matching principle, select import Lincoln wlding, gas shield welding be low-alloy copper plating solid core welding wire SuperArc
LA-100 (φ 1.1mm), welding rod are low-alloy low-hydrogen electrode Excalibur 11018M MR (φ 4.0mm).
7.2 welding conditions
The welding rod that pilot seam is selected should match with base material, and welding rod used answers strict drying.The present embodiment is using following
Welding parameter: core diameter 4mm, welding current (170 ± 10) A, weldingvoltage (24 ± 2) V, speed of welding (150 ± 10)
mm/min。
Table 2 is to restrain weld seam welding parameter
8, after welding treatment；
After the completion of welding, other subsequent operations such as 72h is placed at room temperature, then carries out next step coloring.
9, weld seam colours: heating sample using flame gun, sample is heated to 500 DEG C~600 DEG C；Keep crack surface abundant
It turns blue；Crackle face color and other fractures in this way at coloring have obvious differentiation, and are not easy to fade.
10, crackle is evaluated:
In order to guarantee to measure the reliability of cracking breakout, this method is combining standard GB/T/T32260.2-2015 " metal
The cold crack of the destructive testing weldment of material weld tests arc welding method part 2: from lock test " and shipbuilding industry mark
On the basis of CB/T4364-2013 " oblique Y type groove welding crack test method " Standard Judgement, all using curved disconnected mode, detection
Fracture upper surface cracking breakout, root cracks rate and section crack rate reduce bring error in other evaluation methods.Specific step
Suddenly are as follows: contained weld seam is removed with sawing machine, it is then on Apparatus for Bending at low-temp that sample is curved disconnected, cracking breakout is judged from section.Tool
Body is as shown in figure 12.
The present invention is that " cold crack of the destructive testing weldment of metal material weld seam tries in national standard GB/T32260.2-2015
Test arc welding method part 2: from lock test " and shipbuilding industry standard CB/T4364-2013 " oblique Y type groove weld crack examination
Proved recipe method " the optimization innovation that carries out in standard base.
1) success rate of oblique Y type groove welding crack test working efficiency and test is substantially improved；It is reasonable by designing
Groove type reduces groove size risk of exceeding criterion, greatly improves test efficiency and success of the test rate；
2) oblique Y root gap error caused by artifact is significantly reduced；Conducive to the equal energy of welder for guaranteeing different level
Weld the oblique Y root gap of standard requirements；
3) cracking breakout measurement result is more acurrate；Weld seam is segmented profile method in this method rejection criteria, avoids profile method
Cause the mistake or the larger situation of error of measurement data；It directlys adopt coloring to break or curved disconnected method, more intuitively measures surface and split
Line rate, root cracks rate and section crack rate.
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments
The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.
Claims (10)
1. a kind of method for examining oblique Y type groove weld crack, it is characterised in that: step includes 1. selecting suitable wlding；②
Optimize retaining wall on slope pattern；3. preweld cleaning；4. test specimen splices；Weld seam is restrained 5. welding；6. pilot seam weld preheating；7. welding
Connect pilot seam；8. after welding treatment；9. weld seam colours；10. crackle is evaluated；
Wherein, the wlding of step 1. uses the wlding to match with base material, and welding rod should dry；
Step 2. in, including prepare sample 1 and 2, the assembling structure of sample 1: it is symmetrical above and below, mutually be in pinnacle wedge surface, sample 2
Assembling structure: both sides are that symmetrical above and below, the mutual wedge surface in pinnacle, the intermediate slope surface to extend up and down, and slope surface are relatively above
Wedge surface entirety bodily sinkage, " the destructive of metal material weld seam tries for the depth and standard GB/T/T32260.2-2015 of sinking
Test the cold crack test arc welding method part 2 of weldment: from lock test " and shipbuilding industry standard CB/T4364-2013 " oblique Y
Type groove welding crack test method " require the oblique Y root gap of postwelding it is consistent；
Step 4. in, sample 1 and sample 2 are assembled, the contained weld seam, opposite for constituting both sides between opposite wedge surface and wedge surface is made
Intermediate pilot seam is constituted between wedge surface and slope surface.
2. the method according to claim 1 for examining oblique Y type groove weld crack, it is characterised in that: step 4. in, will try
Splicing is completed in the wedge surface pinnacle docking contact of the two sides of sample 1 and 2, after splicing is good, is inserted into root along slope surface using clearance gauge, is measured root
Portion gap whether can be within the scope of standard requirements.
3. the method according to claim 1 for examining oblique Y type groove weld crack, it is characterised in that: the operation of step 3.
It is the moisture, greasy dirt and dust for removing the specimen surface processed before welding.
4. the method according to claim 1 for examining oblique Y type groove weld crack, it is characterised in that: 5. step restrains weldering
The welding of seam: restraining weld seam is V-type symmetrical above and below, and contained weld seam is divided into a upper left, upper right, lower left side and lower right four when welding
Position, welding sequence are upper left → upper right → lower left side → lower right, and each welding a time symmetrical above and below is recycled with this until weldering is full
Entire weld seam.
5. the method according to claim 1 for examining oblique Y type groove weld crack, it is characterised in that: step be 6. in order to
It obtains small iron and grinds preheating sensitive temperature, need to carry out different temperatures test to sample；Weld preheating temperature uses 170 DEG C, 150
DEG C, 130 DEG C, 110 DEG C four different preheating temperatures tests.
6. the method according to claim 1 for examining oblique Y type groove weld crack, it is characterised in that: 7. step welds examination
When testing weld seam according to etc. strong matching principle, the welding rod of selection should match with base material, welding rod used answers strict drying.
7. the method according to claim 1 for examining oblique Y type groove weld crack, it is characterised in that: step is 8. at postwelding
Reason is to place 72h at room temperature after the completion of welding.
8. the method according to claim 1 for examining oblique Y type groove weld crack, it is characterised in that: step 9. weld seam
Color is to be heated sample using flame gun, and sample is heated to 500 DEG C~600 DEG C, crack surface is made sufficiently to turn blue；In this way at coloring
Crackle face color and other fractures just have obvious differentiation, and be not easy to fade.
9. the method according to claim 1 for examining oblique Y type groove weld crack, it is characterised in that: step 10. comment by crackle
Fixed: in standard GB/T/T32260.2-2015, " cold crack of the destructive testing weldment of metal material weld seam tests arc-welding side
Method part 2: from lock test " and shipbuilding industry mark CB/T4364-2013 " oblique Y type groove welding crack test method " standard
On the basis of judge, fracture upper surface cracking breakout, root cracks rate and section crack rate are all detected using curved disconnected mode.
10. the method according to claim 9 for examining oblique Y type groove weld crack, it is characterised in that: use curved disconnected mode
The concrete operations of detection fracture upper surface cracking breakout, root cracks rate and section crack rate are to be removed contained weld seam with sawing machine,
Then make sample 1 and sample 2 from commissure dialysis curved break of sample on Apparatus for Bending at low-temp, cracking breakout is judged from section.
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| CN110640270A (en) * | 2019-09-24 | 2020-01-03 | 九江海天设备制造有限公司 | Steel plate welding process capable of resisting lateral bending |
| CN112067781A (en) * | 2020-08-21 | 2020-12-11 | 平顶山平煤机煤矿机械装备有限公司 | Test method for welding cold crack sensitivity of hydraulic support structural part |
| CN112453656A (en) * | 2020-10-09 | 2021-03-09 | 江阴兴澄特种钢铁有限公司 | Welding method of thin-wall thick high-strength steel plate |
| CN113732555A (en) * | 2020-05-29 | 2021-12-03 | 宝山钢铁股份有限公司 | Low-carbon microalloyed steel weldability evaluation method based on manual welding of low-hydrogen type welding rod |
| CN113959801A (en) * | 2021-09-14 | 2022-01-21 | 中国第一汽车股份有限公司 | Welding cold crack test evaluation method |
| CN117139780A (en) * | 2023-08-22 | 2023-12-01 | 鞍钢股份有限公司 | Member and method for welding crack sensitivity test of electro-gas welding |
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| CN113732555A (en) * | 2020-05-29 | 2021-12-03 | 宝山钢铁股份有限公司 | Low-carbon microalloyed steel weldability evaluation method based on manual welding of low-hydrogen type welding rod |
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| CN112453656A (en) * | 2020-10-09 | 2021-03-09 | 江阴兴澄特种钢铁有限公司 | Welding method of thin-wall thick high-strength steel plate |
| CN113959801A (en) * | 2021-09-14 | 2022-01-21 | 中国第一汽车股份有限公司 | Welding cold crack test evaluation method |
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