CN102528241A - Method for welding high-strength steel hydraulic support member - Google Patents
Method for welding high-strength steel hydraulic support member Download PDFInfo
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- CN102528241A CN102528241A CN2012100334713A CN201210033471A CN102528241A CN 102528241 A CN102528241 A CN 102528241A CN 2012100334713 A CN2012100334713 A CN 2012100334713A CN 201210033471 A CN201210033471 A CN 201210033471A CN 102528241 A CN102528241 A CN 102528241A
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Abstract
The invention discloses a method for welding a high-strength steel hydraulic support member. The method comprises the following steps of: 1, determining a welding starting point; 2, pre-heating the welding starting point; 3, selecting welding materials; 4, determining welding process parameters, namely implementing an arc welding method, and welding under the protection of mixed gas of 80 volume percent of Ar and 20 volume percent of CO2, wherein the welding current is between 320 and 350A; the arc voltage is between 30 and 35V; the gas flow is 25L/min; and a phi1.6mm solid core welding wire is adopted, and the dry elongation of the welding wire is between 15 and 25mm; 5, welding; and 6, destressing. According to the method, the welding sequence is reasonable, a welded part is fixed by a rigid fixing method, symmetrical welding is implemented in the welding process, and welding is implemented from the center to two sides, so that cracks are reduced effectively, an operation environment for welders is improved, production efficiency is improved, a production cycle is shortened, and production cost is reduced.
Description
Technical field
The present invention relates to the solder technology of high strength steel, specifically relate to a kind of welding method of high strength steel hydraulic support member, be mainly used in the welding of hydraulic support structural member.
Background technology
Hydraulic support is the supporting facility of mine, and present high-end hydraulic support adopts tensile strength to reach the low-alloy high-strength steel (like Q690, Q890 etc.) of 800 ~ 1000Mpa.This material solderability is relatively poor, and it is big mainly to show as tendency of hardenability, is prone to produce cold crack, and welding residual stress is difficult for eliminating, and shaping surface is bad etc.And with this material application in the production of hydraulic support, the welding production difficulty of bringing thus is obvious further.It is very big mainly to show as the welding job amount, welding stress and Deformation control difficulty, and welding residual stress is difficult for eliminating, and post welding distortion is serious, and complex process, and labour intensity is high; The material weldability is poor, is prone to crack, and joint performance is difficult for meeting design requirement; Manufacturing requirements is high, unstable product quality etc.
Traditional handicraft mainly is through, whole preheating before the weldering to the welding of these type of steel, strong or superpower couplings such as welding material employing, and measures such as postwelding whole removing stress tempering realize.Yet the traditional handicraft method possibly cause the problem of following several respects:
(1) whole preheating causes the welder to weld environment badly maybe can't to weld before the weldering;
(2) strong or superpower coupling such as welding material is prone to cause cold crack;
(3) postwelding whole removing stress tempering required time is longer.
Therefore, the welding method of traditional high strength steel hydraulic support member need be improved.
Summary of the invention
The objective of the invention is to avoid above-mentioned weak point of the prior art, a kind of welding method of high strength steel hydraulic support member is provided, it can improve weldquality, reduces the crackle rate, guarantees product quality, practices thrift cost, enhances productivity.
The main at present low-alloy high-strength steel (like Q690, Q890 etc.) that adopts tensile strength to reach 800～1000MPa is produced high-end hydraulic support member, and its yield strength is respectively
,
.The alloying principle of such steel is to have improved the intensity of steel through adding Mn, Si, and the crystal grain that added Ti, V, Nb refinement has increased the plasticity and the toughness of steel; Add rare earth element and take off S and the objectionable impurities that purifies steel, improve the performance of steel.This type of steel postwelding internal stress is bigger, and is easy to generate crackle.
The welding method of a kind of high strength steel hydraulic support member of the present invention, its step is following:
The first step, confirm the welding starting point: the centre position of selecting high strength steel hydraulic support member weld seam is as the welding starting point;
Second step, welding starting point preheating: adopt the oxy-acetylene mode of heating, preheat temperature >=150 ℃,＜180 ℃; Preheating is controlled in the scope of welding starting point both sides 300-500mm;
In the 3rd step, select welding material for use: select welding material for use by low strong matching principle, i.e. the low intensity level (intensity rank is 100Mpa) of welding material strength ratio mother metal; Because the strength of parent level is high especially, internal stress is big, fire check, cold crack, tendency of hardenability and hydrogen induced cracking sensitiveness are strong.Adopt low strong matching principle, can effectively reduce crackle tendency (particularly cold crack), thereby significantly reduce weld crack; Again because mostly the fracture of weld seam is to appear at the heat affected area but not weld seam, so the intensity of welding material does not influence the bulk strength of welding structural element.
In the 4th step, confirm welding condition: adopt arc-welding method, welding current 320-350A, arc voltage 30-35V; The employing volume is 80%Ar+20%CO
2Mixed gas arc welding connects, gas flow 25L/min; φ 1.6mm solid core welding wire, dry extension of electrode are 15-25mm;
In the 5th step, implement welding: begin from the welding starting point,, carry out continuously, the insulation of side weld limit respectively to the both sides symmetrical welding;
In the 6th step, stress removing: adopt while welding to be incubated welding the position with asbestos cloth, postwelding knocks weld edge with hammer and eliminates stress.
Further, carrying out for the 5th step when implementing welding, the high strength steel hydraulic support is being prone to produce the deformed configurations part is fixed on and forces to weld on the welding clamp, promptly adopting fixedly high strength steel hydraulic support member of rigid fixation, be out of shape with control;
The present invention compares with prior art has following advantage: because welding sequence is reasonable; The parts that adopt the rigid fixation pipeline to be soldered; Adopt the symmetry welding in the welding process, weld to both sides, effectively reduced the generation of crackle from the centre; Improve welder's operating environment, improved the production efficiency shortening production cycle, reduced production cost.
Description of drawings
Fig. 1 is a high strength steel hydraulic support sketch map;
Fig. 2 is the face guard front view;
Fig. 3 is the A-A cutaway view of Fig. 2;
Fig. 4 is the B-B cutaway view of Fig. 2;
Fig. 5 is the fixing back-to-back sketch mapes of two face guards;
Fig. 6 is the left view of Fig. 5.
Among the figure: 1-face guard, 2-extensible canopy, 3-back timber, 4-caving shield; 5-front rod, 6-back link, 7-base, 8-the first position while welding; 9-the first weld seam welding starting point, 10-the second position while welding, 11-the second weld seam welding starting point, the lacing wire of 12-technology.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
The welding method of a kind of high strength steel hydraulic support member of the present invention, its step is following:
The first step, confirm the welding starting point: the centre position of selecting high strength steel hydraulic support member weld seam is as the welding starting point;
Second step, welding starting point preheating: adopt the oxy-acetylene mode of heating, preheat temperature >=150 ℃,＜180 ℃; Preheating is controlled in the scope of welding starting point both sides 300-500mm, and can not influence the performance of mother metal when noting preheating;
In the 3rd step, select welding material for use: select welding material for use by low strong matching principle, i.e. the low intensity level (intensity rank is 100Mpa) of welding material strength ratio mother metal; To the Q690 material, its tensile strength is about 800Mpa, and selecting tensile strength for use according to low strong matching principle when selecting welding material for use is the welding material of 700Mpa; To the Q890 material, its tensile strength is about 1000Mpa, and selecting tensile strength for use according to low strong matching principle when selecting welding material for use is the welding material of 900Mpa.
In the 4th step, confirm welding condition: adopt arc-welding method, welding current 320-350A, arc voltage 30-35V; The employing volume is 80%Ar+20%CO
2Mixed gas arc welding connects, gas flow 25L/min; φ 1.6mm solid core welding wire, dry extension of electrode are 15-25mm; The sweating heat input quantity is excessive or too smallly all can exert an influence by cold and hot crackle, and hot input quantity is excessive, and the high-temperature region overstand is prone to produce fire check, the too small easy generation cold crack of hot input quantity.
In the 5th step, implement welding: begin from the welding starting point,, carry out continuously, the insulation of side weld limit respectively to the both sides symmetrical welding; Necessary continuous sequence does not allow to be interrupted midway during welding, needs preheating more than 100 ℃ as interrupting before the welding once more.
In the 6th step, stress removing: adopt while welding to be incubated welding the position with asbestos cloth, postwelding knocks weld edge with hammer and eliminates stress.
Further, carrying out for the 5th step when implementing welding, the high strength steel hydraulic support is being prone to produce the deformed configurations part is fixed on and forces to weld on the welding clamp, promptly adopting fixedly high strength steel hydraulic support member of rigid fixation, be out of shape with control.
Referring to high-strength steel sheet hydraulic support shown in Figure 1, constitute by the back link that is connected base 76, front rod 5, caving shield 4, back timber 3, extensible canopy 2 and face guard 1, the present invention successful Application on the member of ZY8600D high-strength steel sheet hydraulic support.
Referring to Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6; Existing is example with high strength steel hydraulic support member face guard 1; Being about to two face guards that assembled 1 draws close back-to-back; Two face guard edges fixedly weld the formation assembly with 16 technology lacing wires 12, then, respectively first weld seam welding starting point 9 of first position while welding 8 on the face guard 1, second weld seam welding starting point 11 of second position while welding 10 are welded according to above-mentioned welding method.
High strength steel hydraulic support ZY8600D welding procedure relates to the welding of 80 feather weight and 90 kilogram level high-tensile steel plates.The present invention mainly solves high-strength steel sheet and can weld poorly, and postwelding is easy to generate the problem that defectives such as hot and cold crackle cause.Main points are: cancellation weld preheating or reduction preheat temperature; Cancellation post weld heat treatment or shortening heat processing time and other technological measures make postwelding part each item performance indications reach designing requirement.The production in enormous quantities of the very suitable high strength steel plate welding of present technique scheme.
Claims (2)
1. the welding method of a high strength steel hydraulic support member, its step is following:
The first step, confirm the welding starting point: the centre position of selecting high strength steel hydraulic support member weld seam is as the welding starting point;
Second step, welding starting point preheating: adopt the oxy-acetylene mode of heating, preheat temperature >=150 ℃,＜180 ℃; Preheating is controlled in the scope of welding starting point both sides 300-500mm;
In the 3rd step, select welding material for use: select welding material for use by low strong matching principle, i.e. the low intensity level of welding material strength ratio mother metal;
In the 4th step, confirm welding condition: adopt arc-welding method, welding current 320-350A, arc voltage 30-35V; The employing volume is 80%Ar+20%CO
2Mixed gas arc welding connects, gas flow 25L/min; φ 1.6mm solid core welding wire, dry extension of electrode are 15-25mm;
In the 5th step, implement welding: begin from the welding starting point,, carry out continuously, the insulation of side weld limit respectively to the both sides symmetrical welding;
In the 6th step, stress removing: adopt while welding to be incubated welding the position with asbestos cloth, postwelding knocks weld edge with hammer and eliminates stress.
2. the welding method of a kind of high strength steel hydraulic support member according to claim 1 is characterized in that: carrying out for the 5th step when implementing welding, the high strength steel hydraulic support is being prone to produce the deformed configurations part is fixed on and forces to weld on the welding clamp.
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| CN 201210033471 CN102528241B (en) | 2012-02-15 | 2012-02-15 | Method for welding high-strength steel hydraulic support member |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106914686A (en) * | 2017-03-08 | 2017-07-04 | 郑州煤矿机械集团股份有限公司 | The method for carrying out hydraulic support structural member automatic welding using diameter 1.6mm welding wires |
| CN108274100A (en) * | 2018-04-26 | 2018-07-13 | 郑州煤矿机械集团股份有限公司 | The welding method of oil cylinder of hydraulic support stainless joint seat |
| CN108526742A (en) * | 2018-04-26 | 2018-09-14 | 郑州煤矿机械集团股份有限公司 | Hydraulic support column nest method for assembling and welding |
| CN111375926A (en) * | 2020-04-20 | 2020-07-07 | 中煤北京煤矿机械有限责任公司 | Method for welding ultrahigh-strength steel plate Q1150 of hydraulic support |
| CN111774747A (en) * | 2020-06-24 | 2020-10-16 | 中煤北京煤矿机械有限责任公司 | Base assembling and welding sequence strengthening method |
| CN114833487A (en) * | 2022-03-22 | 2022-08-02 | 安阳钢铁股份有限公司 | Welding method for 1000MPa steel for coal mine hydraulic support |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106914686A (en) * | 2017-03-08 | 2017-07-04 | 郑州煤矿机械集团股份有限公司 | The method for carrying out hydraulic support structural member automatic welding using diameter 1.6mm welding wires |
| CN106914686B (en) * | 2017-03-08 | 2019-06-07 | 郑州煤矿机械集团股份有限公司 | The method for carrying out hydraulic support structural member automatic welding using diameter 1.6mm welding wire |
| CN108274100A (en) * | 2018-04-26 | 2018-07-13 | 郑州煤矿机械集团股份有限公司 | The welding method of oil cylinder of hydraulic support stainless joint seat |
| CN108526742A (en) * | 2018-04-26 | 2018-09-14 | 郑州煤矿机械集团股份有限公司 | Hydraulic support column nest method for assembling and welding |
| CN108526742B (en) * | 2018-04-26 | 2020-04-21 | 郑州煤矿机械集团股份有限公司 | Hydraulic support column nest assembling and welding method |
| CN108274100B (en) * | 2018-04-26 | 2020-06-16 | 郑州煤矿机械集团股份有限公司 | Welding method of stainless steel joint seat of hydraulic support oil cylinder |
| CN111375926A (en) * | 2020-04-20 | 2020-07-07 | 中煤北京煤矿机械有限责任公司 | Method for welding ultrahigh-strength steel plate Q1150 of hydraulic support |
| CN111774747A (en) * | 2020-06-24 | 2020-10-16 | 中煤北京煤矿机械有限责任公司 | Base assembling and welding sequence strengthening method |
| CN111774747B (en) * | 2020-06-24 | 2022-04-01 | 中煤北京煤矿机械有限责任公司 | Base assembling and welding sequence strengthening method |
| CN114833487A (en) * | 2022-03-22 | 2022-08-02 | 安阳钢铁股份有限公司 | Welding method for 1000MPa steel for coal mine hydraulic support |
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| CN102528241B (en) | 2013-08-07 |
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