CN108581140A

CN108581140A - Gunmetal welding procedure

Info

Publication number: CN108581140A
Application number: CN201810839794.9A
Authority: CN
Inventors: 沈亚仁
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-07-27
Filing date: 2018-07-27
Publication date: 2018-09-28

Abstract

The invention belongs to welding technology fields, specifically disclose a kind of gunmetal welding procedure, carry out drying and the pre-heat treatment to the part within groove and weld seam both sides 30mm with flame before welding, remove water, oil and oxide on surface；Weld seam is heat-treated after welding；The gunmetal welding procedure of the present invention, can effectively prevent the generation of the defect of weld crack and weld blowhole, meet the actual needs of engineering project.

Description

Gunmetal welding procedure

Technical field

The invention belongs to welding technology field more particularly to a kind of gunmetal welding procedures.

Background technology

In statue engineering, entire statue shell is welded by 5~16mm cast bronze copper coins system of spelling, interior steel construction branch Support, while it is commercial to have the function of museum etc., therefore rational bronze welding procedure is the key that ensure entire construction quality, tin Bronze has good casting, corrosion-resistant, air-tightness and workability energy；There is no the standard No. of such product in national standard, It is a certain amount of tin and zinc being added on the basis of national standard ZQSn4-3 used by some statue engineerings, makes the ratio of tin and zinc Relatively reach 7% and 3% and be formed by tin zinc blueness paulownia material, has been allowed to have more good castability and corrosion resistance, and tin zinc is green The thermal conductivity of copper is very big, more on being welded with the alloying element of influence, easy tos produce defect in the welding process.

Invention content

For the defects in the prior art, the present invention provides a kind of gunmetal welding procedure, and welding can be effectively prevent to split The generation of the defect of line and weld blowhole meets the actual needs of engineering project.

The present invention a kind of gunmetal welding procedure, before welding with flame to groove and weld seam both sides 30mm within Part carries out drying and the pre-heat treatment, removes water, oil and oxide on surface；Weld seam is heat-treated after welding, copper is in liquid When can dissolve a large amount of hydrogen, but solubility substantially reduces in cooling and process of setting, and copper thermal conductivity is exceedingly fast, weld seam crystallization speed Accelerate, superfluous hydrogen has little time to escape, and does not just form stomata after fusion area focuses in weld seam；In addition oxidation at high temperatures is cuprous and gas Body H, CO reaction generates the vapor and CO for not being fused to copper₂Gas, these gases have little time to escape when weld metal solidifies, Stomata can be formed in weld seam, stomata is typically distributed across Weld pipe mill and nearly fusion area, at the heat before welding and after welding Reason can reduce the variation range of base material temperature at the beginning and end of welding, reduce the defect of weld blowhole.

Further, when gunmetal mother metal thickness is in 10mm or more or thickness is between 5-10mm and environment temperature is low When 5 DEG C, the preheating temperature before welding is 100-150 DEG C, and the heat treatment method after welding is：Weld seam is heated to 200- 250 DEG C, then asbestos backpack cover is used to keep the temperature slow cooling, avoid temperature change dramatically, there is time enough to be escaped by gas, further prevent The only generation of the defect of weld blowhole.

Further, it is welded by way of welding by both sides and with multilayer multiple tracks row's welding method, welding by both sides uses back gouging Back welding；Suitable for larger-size weld seam, it is ensured that welding quality.

Further, welding when according to the starting the arc, welding, receive arc sequence operate, and striking current be more than welding current and Receive arc current；Slightly larger striking current can guarantee the rapid increase of weld seam temperature, welding current should with the burn-off rate of welding wire and Speed of welding matches, and smaller receipts arc current ensures to fill up arc crater, prevents crater crack from generating；With run-on tab and extraction Plate removes the starting the arc and incomplete fusion, the crater crack postwelding received at arc；The receipts arc of joint, will using decaying or receiving arc function Arc crater fills up, and prevents burner and crater crack, before connector with abrasive machine by joint wear down at angle to ensure that connection is good.

Further, it is 50-60mm that segment back welding, i.e., each weld length are used in welding process, is waited after being cooled to room temperature Next section is welded again；Welding temperature and interlayer temperature can strictly be controlled；Ensure every section, every layer, temperature drops to 50 DEG C between per pass It is welded again below.

Further, it is all cleared up between every layer and per pass in welding process, and is tapped with ball hammer between layer, road； Contain a certain amount of Zn in tin zinc-copper, Zn easily evaporates at high temperature, to carry out security protection in the welding process, and every layer, it is every It all should strictly be cleared up between road, prevent slag inclusion, be mingled with phenomenon generation.It applies small round head hammer to be tapped between layer, road, releases Welding stress is put, prevents crackle from generating.

Further, the width of per pass weld seam is no more than 10mm, is conducive to the roads Dao Yu, between layers good fusion, prevents Undercut.

Further, base material is subjected to tension test before welding, it is ensured that the tensile strength of base material is in 240-280MPa；Welding Weld metal is subjected to appearance, bending, stretching and fracture test afterwards, ensures welding quality with base material close to unanimously.

The beneficial effects of the invention are as follows：The gunmetal welding procedure of the present invention, can effectively prevent weld crack and welding The generation of the defect of stomata meets the actual needs of engineering project.

Description of the drawings

It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In the accompanying drawings, similar element or portion Divide and is generally identified by similar reference numeral.In attached drawing, each element or part might not be drawn according to actual ratio.

Fig. 1 is existing tin zinc blueness paulownia weld dimensions crackle schematic diagram；

Fig. 2 is existing tin zinc blueness paulownia weld seam internal porosity；

Fig. 3 is welding procedure, equipment and material selection block diagram in the present invention；

Fig. 4 is the selection block diagram of center tap of the present invention design, welding condition；

Fig. 5 is the design of TIG scolding tin ormolu connectors and welding sequence schematic diagram；

Fig. 6 is the design of MIG scolding tin ormolu connectors and welding sequence schematic diagram；

Fig. 7 be weld metal carry out appearance, bending, stretching and fracture test specific implementation data block diagram；

Fig. 8 is appearance test real object display diagram；

Fig. 9 is bend test material object display figure；

Figure 10 is tension test material object display figure；

Figure 11 is fracture test material object display figure.

Specific implementation mode

The embodiment of technical solution of the present invention is described in detail below in conjunction with attached drawing.Following embodiment is only used for Clearly illustrate technical scheme of the present invention, therefore be only used as example, and the protection model of the present invention cannot be limited with this It encloses.

It should be noted that unless otherwise indicated, technical term or scientific terminology used in this application should be this hair The ordinary meaning that bright one of ordinary skill in the art are understood.

As shown in Fig. 3-11：The gunmetal welding procedure of the present embodiment, before welding with flame to groove and weld seam two Part within the 30mm of side carries out drying and the pre-heat treatment, and when gunmetal mother metal thickness is in 10mm or more or thickness is in 5- Between 10mm and when environment temperature is less than 5 DEG C, the preheating temperature before welding is 100-150 DEG C, removes water, oil and surface oxidation Object；Weld seam is heat-treated after welding, the heat treatment method after welding is：Weld seam is heated to 200-250 DEG C, is then used Asbestos backpack cover keeps the temperature slow cooling, avoids temperature change dramatically, has time enough to be escaped by gas, further prevents weld blowhole The generation of defect；Copper can dissolve a large amount of hydrogen in liquid, but solubility substantially reduces in cooling and process of setting, copper heat conduction Property be exceedingly fast, weld seam crystallization speed is accelerated, and superfluous hydrogen has little time to escape, and just forms stomata after weld seam not fusion area focusing；Separately Outer oxidation at high temperatures is cuprous to react the vapor and CO for generating and not being fused to copper with gas H, CO₂Gas, these gases are in weld seam gold Have little time to escape when belonging to solidification, can also form stomata in weld seam, stomata is typically distributed across Weld pipe mill and nearly fusion area, passes through Heat treatment before welding and after welding can reduce the variation range of base material temperature at the beginning and end of welding, reduce weld blowhole Defect.

In the present embodiment, operated according to the starting the arc, welding, the sequence of receiving arc when welding, and striking current is more than welding electricity Stream and receipts arc current；Slightly larger striking current can guarantee that the rapid increase of weld seam temperature, welding current should be with the fusing speed of welding wire Degree and speed of welding match, and smaller receipts arc current ensures to fill up arc crater, prevents crater crack from generating；With run-on tab and draw Ejecting plate removes the starting the arc and incomplete fusion, the crater crack postwelding received at arc；The receipts arc of joint is using decaying or receives arc function, Arc crater is filled up, prevents burner and crater crack, before connector with abrasive machine by joint wear down at angle to ensure that connection is good.

In the present embodiment, welded by way of welding by both sides and with multilayer multiple tracks row's welding method, the width of per pass weld seam No more than 10mm, it is conducive to the roads Dao Yu, between layers good fusion, prevents undercut, welding by both sides from using back gouging back welding； Suitable for larger-size weld seam, it is ensured that welding quality, it is 50- that segment back welding, i.e., each weld length are used in welding process 60mm is waited and is welded next section after being cooled to room temperature again；Welding temperature and interlayer temperature can strictly be controlled；Ensure every section, every layer, per pass Between temperature drop to 50 DEG C or less and welded again, all cleared up between every layer and per pass in welding process, and between layer, road It is tapped with ball hammer；Contain a certain amount of Zn in tin zinc-copper, Zn easily evaporates at high temperature, to carry out peace in the welding process Full protection, and all should strictly be cleared up between every layer, per pass, it prevents slag inclusion, be mingled with phenomenon generation.It is applied between layer, road small Ball hammer is tapped, and is discharged welding stress, is prevented crackle from generating.

In the present embodiment, base material is subjected to tension test before welding, it is ensured that the tensile strength of base material is in 240-280MPa； Weld metal is subjected to appearance, bending, stretching and fracture test after welding, ensures welding quality with base material close to unanimously.

Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution The range of scheme should all cover in the claim of the present invention and the range of specification.

Claims

1. a kind of gunmetal welding procedure, it is characterised in that：Within before welding with flame to groove and weld seam both sides 30mm Part carry out drying and the pre-heat treatment, remove water, oil and oxide on surface；Weld seam is heat-treated after welding.

2. gunmetal welding procedure according to claim 1, it is characterised in that：When gunmetal mother metal thickness is in 10mm When above or thickness is between 5-10mm and when environment temperature is less than 5 DEG C, and the preheating temperature before welding is 100-150 DEG C, weldering Heat treatment method after connecing is：Weld seam is heated to 200-250 DEG C, then asbestos backpack cover is used to keep the temperature slow cooling.

3. gunmetal welding procedure according to claim 1, it is characterised in that：By way of welding by both sides and with multilayer Multiple tracks row's welding method is welded, and welding by both sides uses back gouging back welding.

4. gunmetal welding procedure according to claim 3, it is characterised in that：According to the starting the arc, welding, receipts arc when welding Sequence operation, and striking current be more than welding current and receive arc current.

5. gunmetal welding procedure according to claim 1, it is characterised in that：Segment back welding is used in welding process, I.e. each weld length is 50-60mm, waits and welds next section after being cooled to room temperature again.

6. gunmetal welding procedure according to claim 3, it is characterised in that：In welding process between every layer and per pass all It is cleared up, and is tapped with ball hammer between layer, road.

7. gunmetal welding procedure according to claim 3, it is characterised in that：The width of per pass weld seam is no more than 10mm。

8. gunmetal welding procedure according to claim 1, it is characterised in that：Base material is subjected to stretching examination before welding It tests, it is ensured that the tensile strength of base material is in 240-280MPa；Weld metal appearance, bending, stretching and fracture is carried out after welding to try It tests.