CN104764857A - Device for detecting heat cracks of one-side welding and double-faced forming root welding line and testing method - Google Patents
Device for detecting heat cracks of one-side welding and double-faced forming root welding line and testing method Download PDFInfo
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- CN104764857A CN104764857A CN201510160234.7A CN201510160234A CN104764857A CN 104764857 A CN104764857 A CN 104764857A CN 201510160234 A CN201510160234 A CN 201510160234A CN 104764857 A CN104764857 A CN 104764857A
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Abstract
The invention discloses a device for detecting heat cracks of a one-side welding and double-faced forming root welding line and a testing method. The method comprises the following steps: putting two test panels on a rigid bottom plate in parallel; providing an elongated groove and a gasket below a gap between the two test panels by the rigid bottom plate; carrying out one-side welding and double-faced forming on the gap between two steel plates; detecting the test panels and test welding; selecting the test results of different welding wires, different welding current, different arc voltage and different welding speeds in the detection process to be compared, so as to obtain a test conclusion, wherein the device for the test is extremely simple in structure; a complicated instrument does not need to coordinate; kinds of crack generation factors are comprehensively considered by the testing method; the detection process is rapid and accurate; and especially the device has relatively high crack detection rate on welding heat cracks.
Description
Technical field
The present invention relates to welder, particularly relate to and detect flux-cored wire CO
2the device of shielded welding one side welding with back formation root run fire check, and use this device to carry out the evaluation test method detected.
Background technology
In shipbuilding, using band ceramic backing flux-cored wire to carry out one side welding with back formation is a kind of conventional welding technology, this kind of technique adopts special method of operating, weld, and postwelding must ensure that the tow sides of groove can obtain complete solder in the front of the groove of weldment.But this kind of welding technology easily produces fire check at weldment root run place, its generation all has relation with the constraint (restraint) degree of welding, weld seam diffusible hydrogen content, seam organization, weld seam composition and appearance of weld.For this situation, must detect fire check, to ensure that it meets technological requirement, can not impact Ship Structure.
Summary of the invention
The present invention aims to provide a kind of device detecting one side welding with back formation root run fire check, the test method detected is carried out with using this device, to detect boats and ships weld seam fire check quickly and accurately, detect same welding wire easily under different technology conditions simultaneously, or the different welding wires under same process condition produce the possibility of fire check, thus select the combination of process parameters avoiding generation defect, or the good welding wire of cracking resistance.
The device of detection one side welding with back formation root run fire check of the present invention, comprises stiff baseplate, and the test plate (panel) that two pieces to be welded; Two pieces of test plate (panel)s are laid on the plate face of stiff baseplate side by side; The relative side of two test plate (panel)s be top from the top down and the groove from inside to outside tilted, and lower vertical is in the root face in test plate (panel) plate face; The below that stiff baseplate is positioned at the two relative sides of test plate (panel) has strip groove, be placed with liner, and the end face of liner is closely attached on the bottom surface of two test plate (panel)s in groove.
Adopt the device detecting one side welding with back formation root run fire check to carry out the test method detected, comprise the following steps:
A, two pieces of test plate (panel)s to be welded to be laid on stiff baseplate side by side, to make two test plate (panel)s staggered relatively with the side of groove simultaneously, and above the strip groove being positioned at stiff baseplate, the bottom surface of two test plate (panel)s pushes against the liner end face in groove;
B, another three sides of two test plate (panel)s except opposite side are restrained be welded on stiff baseplate;
C, employing flux-cored wire weld two test plate (panel)s;
D, pilot seam are removed after 24 hours in placement and are restrained weld seam, detect after the pilot seam sampling between two test plate (panel)s;
E, on pilot seam, choose macro etch sample, detect weld seam transversal section erosional surface crackle, detect root of weld vertical section surface crack in remaining weld seam section simultaneously.
The device of detection one side welding with back formation root run fire check of the present invention and test method, two test plate (panel)s are placed on stiff baseplate and weld, its relative side composition is with " Y " type groove in gap, being restrained by test plate (panel) after placement completes is welded on stiff baseplate, can weld subsequently to " Y " type groove to be tested.Adopt welding by one side during welding, can double welded joint be formed after welding, and then crack detection is carried out to this pilot seam and test plate (panel).This test apparatus structure used is very simple, instrument and equipment without the need to complexity coordinates, and described test method has considered the factor that various crackle produces, its testing process is quick, accurate, especially has higher crack detection rate to HOT CRACK FOR WELDING P.Obtained experimental result can provide a kind of method for shipyard choose reasonable welding wire and test technology applicability, also provides a kind of test method for welding wire production factory carries out welding wire performance test.Test method can according to crack detection results, adopts different welding wire, different welding current, different arc voltage, the test findings of different welding speed contrasts, draw conclusion (of pressure testing).Make it more synthetically can consider the factor of various crackle, draw conclusion more accurately, also more can suit the actual production conditions of shipyard, select most convenient, accurately test condition.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device detecting one side welding with back formation root run fire check.
Fig. 2 is the diagrammatic cross-section in Fig. 1 shown device A-A direction.
Fig. 3 is the ratio schematic diagram of the spacing M of two test plate (panel)s and the spacing P of root face.
Embodiment
Detect a device for one side welding with back formation root run fire check, comprise stiff baseplate 1, and the test plate (panel) 2 that two pieces to be welded; Two pieces of test plate (panel)s are laid on the plate face of stiff baseplate side by side; The relative side of two test plate (panel)s be top from the top down and the groove 3 from inside to outside tilted, and lower vertical is in the root face 4 in test plate (panel) plate face; The below that stiff baseplate is positioned at the two relative sides of test plate (panel) has strip groove 5, be placed with liner 6, and the end face of liner is closely attached on the bottom surface of two test plate (panel)s in groove.
The gap length of two test plate (panel)s 2 equals the length of side of the root face 4 of test plate (panel).The length of side of root face 4 is 6-10mm, and the groove angle of groove 3 is 20 °.The ratio of the spacing M of two test plate (panel)s and the spacing P of root face is 1:1, and groove angle is then 20 °, experiment results proved, adopts this kind of structure test plate (panel) to test, can obtain test findings the most accurately.
Two test plate (panel)s 2 are laid on the plate face of stiff baseplate 1 side by side, and two test plate (panel)s are positioned within the plate face scope of stiff baseplate completely; Another three sides of two test plate (panel)s 2 except opposite side, restrain with stiff baseplate 1 and welds and form contained weld seam 7; The leg restraining weld seam 7 is 12 ± 0.5mm.Test plate (panel) is positioned on stiff baseplate completely, and make total more firm, contained weld seam also can better weld; Restrain the leg of weld seam employing under the prerequisite of strength of joint both ensureing, the dismounting work of being more convenient for follow-up.
Liner 6 is ceramic backing, and its end face both sides are closely attached on the bottom surface of two test plate (panel)s 2 respectively, in the middle part of end face two test plate (panel)s 2 gap below, and the arc 8 for caving inward.Ceramic backing welding technology is with its excellent processability and Technological adaptability and production efficiency is high, low cost and other advantages is widely used, it be a kind of with special ceramic material for setting off, weld seam is made to force the welding method of shaping efficient, high-quality, low cost, The method avoids back chipping, overhead welding and narrow enclosed environment operation, alleviate the labour intensity of welder, welding production efficiency is significantly improved, and welding quality is guaranteed, and can not work the mischief to human body and environment simultaneously; The arc caved inward then is conducive to the full shaping of pilot seam, also can reserve suitable space and form weld reinforcement.
Hanger 9 stiff baseplate 1 is equipped with.In Marine engineering, parts used are general comparatively large-scale, and in order to simulator actual conditions better, and device parts used are also comparatively large-scale, and the setting of hanger then makes the carrying of device convenient.
Adopt the device detecting one side welding with back formation root run fire check to carry out the test method detected, comprise the following steps:
A, two pieces of test plate (panel)s to be welded to be laid on stiff baseplate side by side, to make two test plate (panel)s staggered relatively with the side of groove simultaneously, and above the strip groove being positioned at stiff baseplate, the bottom surface of two test plate (panel)s pushes against the liner end face in groove;
B, another three sides of two test plate (panel)s except opposite side are restrained be welded on stiff baseplate;
C, employing flux-cored wire weld two test plate (panel)s;
D, pilot seam are removed after 24 hours in placement and are restrained weld seam, detect after the pilot seam sampling between two test plate (panel)s;
E, on pilot seam, choose macro etch sample, detect weld seam transversal section erosional surface crackle, detect root of weld vertical section surface crack in remaining weld seam section simultaneously.
Described test method, in step, the ratio of the spacing M of two test plate (panel)s and the spacing P of root face is 1:1; The size of spacing is 6-10mm; The molten wide and fusion penetration ratio of weld seam is 1:1.
In stepb, the contained leg restraining welding gained weld seam is 12 ± 0.5mm.
In step C, weld when test plate (panel) is in indoor temperature; Flux-cored wire adopts semi-automatic welding by one side; Reverse side weld reinforcement after welding is 1-2mm.
In step D, detection comprises visual examination and surface crack testing.
In step e, when selecting sample, the pilot seam in the scope of reject two ends 10%, according to length direction uniform design three section macro etch samples on the pilot seam at middle part; Two sections of pilot seams between three are cut into slices, shoot off 2mm in bottom, detects root of weld vertical section surface crack; Before sample bottom thickness is excluded, add man-hour external force cause new crackle for exempting to keep away, one reinforced weld can be applied from front in groove before processing, but reinforced weld must adopt ceramic backing completely isolated with pilot seam.
Described test method, can according to crack detection results, adopts different welding wire, different welding current, different arc voltage, the test findings of different welding speed contrasts, draw conclusion (of pressure testing).Make it more synthetically can consider the factor of various crackle, draw conclusion more accurately, also more can suit the actual production conditions of shipyard, select most convenient, accurately test condition.
Claims (10)
1. detect a device for one side welding with back formation root run fire check, it is characterized in that: comprise stiff baseplate (1), and the test plate (panel) that two pieces to be welded (2); Two pieces of test plate (panel)s are laid on the plate face of stiff baseplate side by side; The relative side of two test plate (panel)s be top from the top down and the groove from inside to outside tilted (3), and lower vertical is in the root face (4) in test plate (panel) plate face; The below that stiff baseplate is positioned at the two relative sides of test plate (panel) has strip groove (5), be placed with liner (6), and the end face of liner is closely attached on the bottom surface of two test plate (panel)s in groove.
2. device according to claim 1, is characterized in that: the gap length of two test plate (panel)s (2) equals the length of side of the root face (4) of test plate (panel).
3. device according to claim 1, is characterized in that: another three sides of two test plate (panel)s (2) except opposite side, restrains weld and form contained weld seam (7) with stiff baseplate (1).
4. device according to claim 1, is characterized in that: liner (6) is ceramic backing, and its end face both sides are closely attached on the bottom surface of two test plate (panel)s (2) respectively, in the middle part of end face two test plate (panel)s (2) gap below, and the arc (8) for caving inward.
5. adopt the device detecting one side welding with back formation root run fire check to carry out the test method detected, it is characterized in that comprising the following steps:
A, two pieces of test plate (panel)s to be welded to be laid on stiff baseplate side by side, to make two test plate (panel)s staggered relatively with the side of groove simultaneously, and above the strip groove being positioned at stiff baseplate, the bottom surface of two test plate (panel)s pushes against the liner end face in groove;
B, another three sides of two test plate (panel)s except opposite side are restrained be welded on stiff baseplate;
C, employing flux-cored wire weld two test plate (panel)s;
D, pilot seam are removed after 24 hours in placement and are restrained weld seam, detect after the pilot seam sampling between two test plate (panel)s;
E, on pilot seam, choose macro etch sample, detect weld seam transversal section erosional surface crackle, detect root of weld vertical section surface crack in remaining weld seam section simultaneously.
6. test method according to claim 5, is characterized in that: in step C, welds when test plate (panel) is in indoor temperature; Flux-cored wire adopts semi-automatic welding by one side.
7. test method according to claim 5, is characterized in that: in step D, detects and comprises visual examination and surface crack testing.
8. test method according to claim 5, is characterized in that: in step e, and when selecting sample, the pilot seam in the scope of reject two ends 10%, according to length direction uniform design three macro etch samples on the pilot seam at middle part; Meanwhile, two sections of pilot seams between cutting into slices three, shoot off 2mm in bottom, detects root of weld vertical section surface crack.
9. test method according to claim 8, is characterized in that: before sample bottom thickness is excluded, and applies one reinforced weld before processing from front in groove, and reinforced weld and pilot seam adopt ceramic backing completely isolated.
10. the test method according to the arbitrary claim of claim 5-9, is characterized in that: according to crack detection results, adopts different welding wire, different welding current, different arc voltage, the fast test findings of different welding contrasts, draw conclusion (of pressure testing).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510160234.7A CN104764857A (en) | 2015-04-07 | 2015-04-07 | Device for detecting heat cracks of one-side welding and double-faced forming root welding line and testing method |
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| CN201510160234.7A CN104764857A (en) | 2015-04-07 | 2015-04-07 | Device for detecting heat cracks of one-side welding and double-faced forming root welding line and testing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916888A (en) * | 2019-03-25 | 2019-06-21 | 友联船厂（蛇口）有限公司 | The flux-cored wire cracking resistance energy method of inspection |
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| EP1053822A2 (en) * | 1999-05-21 | 2000-11-22 | Renault | Process for assembling of two high carbon content steel elements by welding and heating tool for such a process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916888A (en) * | 2019-03-25 | 2019-06-21 | 友联船厂（蛇口）有限公司 | The flux-cored wire cracking resistance energy method of inspection |
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Application publication date: 20150708 |