CN102019481B - Plain butt welding process for high-strength hull structural steel - Google Patents
Plain butt welding process for high-strength hull structural steel Download PDFInfo
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- CN102019481B CN102019481B CN 201010568298 CN201010568298A CN102019481B CN 102019481 B CN102019481 B CN 102019481B CN 201010568298 CN201010568298 CN 201010568298 CN 201010568298 A CN201010568298 A CN 201010568298A CN 102019481 B CN102019481 B CN 102019481B
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Abstract
The invention relates to a process for welding a high-strength hull structure steel, in particular to a plain butt welding process for a high strength hull structural steel plate (CCSE69040mm). The butt welding process is characterized in that effective specifications for bevel for welding, weld preheating, welding temperature, welding sequence, welding variables and after-welding cold treatment are provided. The plain butt welding process has the advantages of enabling the process of welding a super-thin high strength steel plate to be implemented smoothly, improving the operating efficiency, saving the raw materials, reducing the production cost, reducing the shipbuilding period, and filling a domestic technical blank on the welding of a high strength thick hull structural steel (CCSE69040mm).
Description
Technical field
The invention particularly relates to high-strength steel welding procedure peculiar to vessel.
Background technology
Solder technology is one of key process technology of modern ships work, and the Ship Welding quality is to estimate the important indicator of shipbuilding quality in hull construction.Therefore, the solder technology progress has crucial meaning to the development that promotes shipbuilding production.In the world, the high strength steel solder technology develops aspect wlding composition and technological design comparatively fast, and application is also in continuous expansion.Steel construction relating under special instructions for use or the bad working environments environment is made the field, and high strength steel occupies more and more important position, has been widely used in fields such as boats and ships, bridge, automobile, skyscraper construction.And domestic, the range of application of high-strength steel is also increasing gradually, but to use generally that is that all right ripe, only account for about 10% of the total consumption of steel, and ratio is less.At present, the intensity of high-strength steel is 400MPa among the standard GB 1499.2-2007, and the high strength steel welding standard is not perfect, and the design studies of associated welds technology exists not enough." material and welding conditions " that publish in July, 2009 of CCS (CCS) do not provide relevant technological specification yet.
The present invention studies for the flat butt welding welding procedure of the thick CCS E690 high-strength steel of 40mm through changing technological measure.
Summary of the invention
Technical problem to be solved by this invention provides the flat butt welding welding technique of a kind of high strength ship hull structure use steel; The flat butt welding of high strength ship hull structure use steel to CCS E690 40mm; More welding material, electric energy and man-hour can be saved; And be easy to processing, can effectively reduce welding deformation, being soldered to property is good.
For solving the problems of the technologies described above, the present invention provides a kind of high strength ship hull structure use steel to put down the butt welding welding technique, it is characterized in that, and be the flat butt welding of high strength ship hull structure use steel of CCS E690 40mm to mother metal, comprise following technological parameter and step:
Bevel for welding: be double-V groove, the butt joint bevel angle is 60 ° ± 5 °;
Preheat temperature: need before the welding to carry out preheating in butt welded seam and the weld seam both sides 150mm scope, preheat temperature reaches 130 ℃-150 ℃ and begins welding;
The welding temperature: during welding between the road temperature should be controlled at 130 ℃-150 ℃;
Welding sequence: adopt multi-pass welding, to fill up the groove in the cross section;
Welding material: adopt Y69 welding wire or welding rod with structural steel yield strength ad eundem;
Welding parameter: welding current 160～240A, arc voltage 22～30V, speed of welding 12～37cm/min, heat input 9～27KJ/cm, electrical characteristics are dc reverse connection;
After welding treatment: welding job need be heated to 200-250 ℃ in weld seam and the both sides 150mm scope after accomplishing, and insulation reaches 2 hours, and then adopts the rock wool pad to cover slow cooling and handle.
As optional, welding manner is gas shielded arc welding or manual electric arc welding.
When welding manner is gas shielded arc welding, welding current 180～240A, arc voltage 27～30V, speed of welding 14～37cm/min, heat input 11～27KJ/cm.
When welding manner is manual electric arc welding, welding current 160～165A, arc voltage 22～27V, speed of welding 12～24cm/min, heat input 9～22KJ/cm.
Before the welding, need at sheet material reverse side frock " horse plate ", slab must take weld preheating and post weld heat treatment to eliminate hydrogen induced cracking.Can't fill up the groove in the cross section owing to single-pass welding during welding; So adopt multi-pass welding to fill up the groove in the cross section; Prevent the generation of weld cracking or delayed crack, simultaneously, the process that preceding one weld seam is " preheating " to one weld seam in back; One weld seam in back is equivalent to the process of " after-baking " concerning preceding one weld seam, improved stress distribution in the welding process effectively, is beneficial to the assurance welding quality.Selection narrow gap welding connects, and can prevent that high-strength steel is overheated, improves weldability; Welding condition such as electric current, voltage and speed of welding etc. have very big influence to rare hot thermal cycle.
The present invention is through changing the flat butt welding that technological process realizes the CCSE69040mm steel plate; It is through measures such as weldability test, qualifications of welding procedure; Make the solder technology scheme of high-strength steel CCS E69040mm steel plate; Make the welding procedure of ultra-thick plate high-strength steel to realize smoothly, can raise labour efficiency, save raw material, reduce production costs, reduce ship building period etc., high-strength steel and large-scale first at home engineering practical application outside this steel grade subrogate country of successful realization.Filled up domestic in this a part of blank of slab high strength ship hull structure use steel E69040mm welding.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment technical scheme of the present invention is further specified.
Fig. 1 is the bevel for welding sketch map.
Fig. 2 is the groove yardstick and the welding sequence figure of carbon dioxide gas arc welding.
Fig. 3 is the groove yardstick and the welding sequence figure of manual electric arc welding.
The specific embodiment
One, prepares before the weldering
1. before the welding, the welder should conscientiously be familiar with construction drawing and technology, and the specification requirement and the quality requirement of understanding product strictly observe process discipline and weld in strict accordance with the welding requirements of this technology.
2. check conscientiously whether groove size and assembly quality meet the quality standard requirement before the weldering.
In the groove and the positive and negative in each 30mm of bevelled edge both sides and end face should remove the residual sticking carbon of water stain, greasy dirt, iron rust, extension slag and carbon plane etc. to the influential foreign material of welding quality.
4. rain, snow sky are forbidden to weld in the open.When envionmental humidity greater than 90% the time, should take corresponding measure, otherwise forbid welding; Carbon dioxide gas arc welding should be taked draught exclusion device when wind speed during greater than 2m/s during welding.
5. must cure 1-2 hour through 380 ℃-400 ℃ before the welding rod weldering, put into heat-preservation cylinder, with getting with usefulness.After 4 hours, the welding rod that does not use should take out again and cure.
6. every dish welding wire should disposablely use continuously, must not stay and put down time use.
Two, welding material and welding method
1. this material can adopt carbon dioxide gas arc welding or manual electric arc welding to weld.
2. welding material adopts Y69 welding wire or the welding rod with structural steel yield strength ad eundem.
Three, welding procedure
1. the bevel for welding form is illustrated in fig. 1 shown below: for 40mm slab CCS E690; Be double-V groove, the butt joint bevel angle is 60 ° ± 5 °, and this shape groove can be saved more welding material, electric energy and man-hour; And be easy to processing; Can effectively reduce welding deformation, because member can stand up, being soldered to property is good.
2. need before the welding to carry out preheating in butt welded seam and the weld seam both sides 150mm scope, preheat temperature reaches 130 ℃-150 ℃ and begins welding, during welding between the road temperature should be controlled at 130 ℃-150 ℃.In the welding process, adopt some temperature meter to measure at any time at reverse side.
3. when segmentation is welded, should monitor, observe the sheet material deformation state at any time,, should adjust welding sequence as far as possible, reduce welding deformation if find the sheet material welding deformation.If can't repeatedly stand up, should carry out the moulding bed template fixing after, carry out the back root cleaning welding.
4. the disposable welding of should trying one's best of every weld seam is accomplished, if a weld seam can not accomplish in disposable welding, then stop welding after, should carry out after-baking on request, when welding once more, carry out preheating again on request, welding.
5. after welding job is accomplished, need be heated to 200-250 ℃ in weld seam and the both sides 150mm scope, be incubated 2 hours, and then adopt the rock wool pad to cover slow cooling and handle.
Four, postwelding cleaning and check
1. the postwelding welder should conscientiously remove the splash of weld seam welding slag and both sides.
2. after having welded, outward appearance and Non-Destructive Testing are carried out in welding.Specific requirement is carried out by relevant requirements.
3. reprocessing of weld defect need thoroughly be removed defective with carbon arc air gouging, removes the position and answers smooth transition.
Embodiment 1
Adopt carbon dioxide gas arc welding:
1, welding material is following: welding wire GFR-110K3 (E761T1-K3C) Φ 1.2mm, carbon dioxide purity >=99.5%.
2, welding sequence and groove yardstick are as shown in Figure 2.
3, welding variables sees the following form 1:
Table 1 carbon dioxide gas arc welding
Embodiment 2
Adopt manual electric arc welding to weld:
1, welding material is following: welding rod CHE807RH (E8015-G) Φ 4mm.
2, welding sequence and groove yardstick are as shown in Figure 3.
3, welding variables sees the following form 2:
Table 2 electric arc manual welding
It should be noted last that; The above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1. the flat butt welding welding technique of high strength ship hull structure use steel is characterized in that, is the flat butt welding of high strength ship hull structure use steel of CCS E690 40mm to mother metal, comprises following technological parameter and step:
Bevel for welding: be double-V groove, the butt joint bevel angle is 60 ° ± 5 °;
Preheat temperature: need before the welding to carry out preheating in butt welded seam and the weld seam both sides 150mm scope, preheat temperature reaches 130 ℃-150 ℃ and begins welding;
The welding temperature: during welding between the road temperature should be controlled at 130 ℃-150 ℃;
Welding sequence: adopt multi-pass welding, to fill up the groove in the cross section;
Welding material: adopt Y69 welding wire or welding rod with structural steel yield strength ad eundem;
Welding parameter: welding current 160～240A, arc voltage 22～30V, speed of welding 12～37cm/min, heat input 9～27KJ/cm, electrical characteristics are dc reverse connection;
After welding treatment: welding job need be heated to 200-250 ℃ in weld seam and the both sides 150mm scope after accomplishing, and insulation reaches 2 hours, and then adopts the rock wool pad to cover slow cooling and handle.
2. high strength ship hull structure use steel according to claim 1 is put down the butt welding welding technique, it is characterized in that welding manner is a gas shielded arc welding.
3. high strength ship hull structure use steel according to claim 1 is put down the butt welding welding technique, it is characterized in that welding manner is manual electric arc welding.
4. high strength ship hull structure use steel according to claim 2 is put down the butt welding welding technique, it is characterized in that, when welding manner is gas shielded arc welding; Welding current 180～240A; Arc voltage 27～30V, speed of welding 14～37cm/min, heat input 11～27KJ/cm.
5. high strength ship hull structure use steel according to claim 3 is put down the butt welding welding technique, it is characterized in that, when welding manner is manual electric arc welding; Welding current 160～165A; Arc voltage 22～27V, speed of welding 12～24cm/min, heat input 9～22KJ/cm.
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