CN101323039A - Non-prewarming welding method for thick-wall red copper and low-carbon steel dissimilar metal material - Google Patents

Non-prewarming welding method for thick-wall red copper and low-carbon steel dissimilar metal material Download PDF

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Publication number
CN101323039A
CN101323039A CNA2008100124174A CN200810012417A CN101323039A CN 101323039 A CN101323039 A CN 101323039A CN A2008100124174 A CNA2008100124174 A CN A2008100124174A CN 200810012417 A CN200810012417 A CN 200810012417A CN 101323039 A CN101323039 A CN 101323039A
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CN
China
Prior art keywords
welding
red copper
arc
thick
helium
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CNA2008100124174A
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Chinese (zh)
Inventor
刘殿宝
刘放
李海涛
魏兴明
陈凯
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渤海船舶重工有限责任公司
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Priority to CNA2008100124174A priority Critical patent/CN101323039A/en
Publication of CN101323039A publication Critical patent/CN101323039A/en

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Abstract

The invention relates to a non-preheating welding method of thick-wall red copper and low carbon steel dissimilar materials and includes the following welding process steps: the non-preheated tungsten electrode helium-arc welding with nickel-copper alloy welding wires is adopted in the location of welded joints, the welding current is 175 to 450 A, protective gas is pure helium, flow volume is 10 to 15 L per minute, the diameters of a tungsten electrode is Phi 4 to 5mm, the length for positioning the welding joint is 10 to 15mm and the distance between two positioned welded joints is 100 to 150mm; The non-preheated tungsten electrode helium-arc welding with the nickel-copper alloy welding wires is adopted in the backing welding of the welded joint, and in the welding process, electric arc is led to one side of the red copper with faster heat conduction, and the heat at the edge of the electric arc is used for melting the low carbon steel, and the temperature of a molten pool is reduced by adding the nickel-copper alloy welding wires, and the electric arc stays for a while at one side of the red copper which is the female material of a joint without suspending at the side of the low carbon steel; the welded joints can be filled by using the non-preheated tungsten electrode arc welding with the nickel-copper alloy welding wires after the backing welding is finished. The method solves the problems of non-preheating welding and hot cracking trend of the thick-wall red copper and low carbon steel dissimilar materials and improves the solidification temperature, strength and plasticity of the welded joint.

Description

A kind of thick-wall red copper and low-carbon steel dissimilar metal material non-prewarming welding method

Technical field

The present invention relates to a kind of welding method, particularly relate to a kind of thick-wall red copper and low-carbon steel dissimilar metal material non-prewarming welding method.

Background technology

The every performance of red copper and mild steel differs all bigger.The thermal conductivity of red copper than the big 7-11 of mild steel doubly, during welding the mother metal heat radiation too fast, and fill metal and be difficult to fusion.Mother metal thickness and size are bigger, and heat radiation is more serious, and also more difficulty reaches fusion temperature, even adopt the high power welding power supply, must still need take to heat synchronously measure in the welding process in weld preheating.In order to keep workpiece temperature, labor strength is big, and execution conditions are abominable, and it is very big to splash, and weldquality is very poor, and the mother metal performance loss is very big, and property of welded joint seriously descends.Liquid copper or copper alloy have stronger osmosis to the crystal boundary of nearly seam district steel, easily form so-called infiltration crackle under action of pulling stress.The linear expansion coefficient of red copper and shrinkage factor are also big a lot of than iron, and postwelding can produce bigger distortion and stress, the existence of impurity element in the copper in addition, and the welding point hot cracking tendency is big.

Mild steel plasticity and impact flexibility are good, and the joint plasticity and the impact flexibility that are welded into are also fine.During welding, generally do not need preheating, interlayer temperature and after heat, postwelding also needn't adopt heat treatment to improve tissue.

At present, the means of fusion arc welding welding technique of red copper and mild steel self mainly contains SMAW, gas metal-arc welding, gas tungstun arc welding, submerged-arc welding and carbon arc welding etc., and the above red copper of 4mm needs 200-450 ℃ of preheating.Red copper and low-carbon steel dissimilar metal material welding method all are to use flame brazing method basically, need preheating more than 550 ℃ during welding, the welding condition very severe, efficiency is low, welding quality is difficult for guaranteeing, Weld Performance (intensity, plasticity, resistance to corrosion seawater etc.) is very poor, and the mother metal performance loss is also very big.

Summary of the invention

The technical problem to be solved in the present invention, provide a kind of under the condition of not preheating, can realize the welding of thick-wall red copper and mild steel, and avoid hot and cold crackle tendency in the welding process, guarantee a kind of thick-wall red copper and the low-carbon steel dissimilar metal material non-prewarming welding method of welding point overall synthetic performance.

The technical solution used in the present invention is:

A kind of thick-wall red copper and low-carbon steel dissimilar metal material non-prewarming welding method; be the direct current source of welding current (output current is greater than 500A) that adopts power output bigger, with the tungsten polar helium arc of pure helium as protective gas, thereby realize the thermal weld in advance of thick-wall red copper and foreign material.Its method is as follows:

(1) with thick-wall red copper to be welded and mild steel finished edge.

(2) remove interior oxide skin, oil, rust, water and other dirt of 30mm scope around the place to be welded, and use the acetone wiped clean.

(3) tack weld adopts tungsten polar helium arc to dose The welding of corronil welding wire, welding current 175~450A, protective gas are pure helium, and flow is 10~15L/min, and the tungsten electrode diameter adopts Tack weld length is 10~15mm, and the distance between two tack welds is 100~150mm.

(4) weld seam bottoming welding adopts not preheating of tungsten polar helium arc to dose The welding of corronil welding wire, welding current 175~450A, protective gas are pure helium, flow 10~15L/min, the tungsten electrode diameter is Need during operation electric arc is pointed to heat conduction than red copper one side faster, utilize electric arc edge heat that mild steel is melted, it is overheated to prevent, and reduces bath temperature by dosing the corronil welding wire, improves the weld seam setting temperature, intensity, plasticity, prevents crackle and pore; To guarantee in the welding process that electric arc stops slightly in joint mother metal red copper one side, and not stop, to guarantee that root of joint fusion is good and to realize appearance of weld in mild steel one side.

(5) after backing run welds, can adopt tungsten polar helium arc and dose Weld seam is filled in the not pre-thermal weld of corronil welding wire, and corronil welding wire, protective gas, welding variables that welding is selected for use are identical with backing weld seam.

In the above-mentioned described corronil welding wire, the content ratio scope of copper and nickel is 58~75%: 42~25% by weight percentage.

The good effect that the present invention obtains is:

(1) solved the welding of thick-wall red copper and low-carbon steel dissimilar metal material under the condition of not preheating;

(2) solved the problem of hot cracking tendency in thick-wall red copper and the low-carbon steel dissimilar metal material welding process;

(3) dose the corronil welding wire by manual, improved weld seam setting temperature, intensity, plasticity, prevent crackle, pore.

(4) said method is equally applicable to the not pre-thermal weld of thick-wall red copper and aluminium bronze foreign material.

The specific embodiment

Embodiment 1

Below in conjunction with technical scheme narration the specific embodiment of the present invention.

Thick-wall red copper and mild steel welding, its method and step are as follows:

(1) with thick-wall red copper to be welded and low-carbon steel material finished edge, groove type as butt joint or corner connection, and is processed the groove of corresponding form according to Type of Welding.

(2) remove interior oxide skin, oil, rust, water and other dirt of 30mm scope around the place to be welded, and use the acetone wiped clean.

(3) tack weld adopts tungsten polar helium arc to dose The welding of corronil welding wire, wherein, the content ratio scope of copper and nickel is 58%: 42% by weight percentage, and welding current is 175A, and protective gas adopts pure helium, and flow is 10L/min, adopts diameter Tungsten electrode, the tack weld weld length guarantees that at 10mm the distance between two tack welds is 100mm.

(4) weld seam bottoming welding adopts not preheating of tungsten polar helium arc to dose Corronil welding wire welding method, wherein, the content ratio scope of copper and nickel is 65%: 35%, and welding parameter is: welding current is 175A, and protective gas is pure helium, and its flow is 10L/min, the tungsten electrode diameter In the welding process, electric arc is pointed to heat conduction ratio red copper one side faster, utilize electric arc edge heat that mild steel is melted, it is overheated to prevent, and reduce bath temperature by dosing the corronil welding wire, and improve the weld seam setting temperature, intensity, plasticity, prevent crackle and pore; And, electric arc is stopped slightly in joint mother metal red copper one side, and does not stop, to guarantee that root of joint fusion is good and to realize appearance of weld in mild steel one side.

(5) after backing run welded, employing not preheating of tungsten polar helium arc was also dosed Weld seam is filled in the welding of corronil welding wire, and the corronil welding wire that welding is selected for use, protective gas, standard parameter weld identical with the weld seam bottoming.

Embodiment 2

Below in conjunction with technical scheme narration the specific embodiment of the present invention.

Thick-wall red copper and mild steel welding, its method and step are as follows:

(1) with thick-wall red copper to be welded and low-carbon steel material finished edge, groove type as butt joint or corner connection, and is processed the groove of corresponding form according to Type of Welding.

(2) remove interior oxide skin, oil, rust, water and other dirt of 30mm scope around the place to be welded, and use the acetone wiped clean.

(3) tack weld adopts tungsten polar helium arc to dose The welding of corronil welding wire, wherein, the content ratio scope of copper and nickel is 60%: 40% by weight percentage, and welding current is 400A, and protective gas adopts pure helium, and flow is 13L/min, adopts diameter Tungsten electrode, the tack weld weld length guarantees that at 13mm the distance between two tack welds is 130mm.

(4) weld seam bottoming welding adopts not preheating of tungsten polar helium arc to dose Corronil welding wire welding method, wherein, the content ratio scope of copper and nickel is 60%: 40%, and welding parameter is: welding current is 400A, and protective gas is pure helium, and its flow is 13L/min, the tungsten electrode diameter In the welding process, electric arc is pointed to heat conduction ratio red copper one side faster, utilize electric arc edge heat that mild steel is melted, it is overheated to prevent, and reduce bath temperature by dosing the corronil welding wire, and improve the weld seam setting temperature, intensity, plasticity, prevent crackle and pore; And, electric arc is stopped slightly in joint mother metal red copper one side, and does not stop, to guarantee that root of joint fusion is good and to realize appearance of weld in mild steel one side.

(5) after backing run welded, employing not preheating of tungsten polar helium arc was also dosed Weld seam is filled in the welding of corronil welding wire, and the corronil welding wire that welding is selected for use, protective gas, standard parameter weld identical with the weld seam bottoming.

Embodiment 3

Below in conjunction with technical scheme narration the specific embodiment of the present invention.

Thick-wall red copper and mild steel welding, its method and step are as follows:

(1) with thick-wall red copper to be welded and low-carbon steel material finished edge, groove type as butt joint or corner connection, and is processed the groove of corresponding form according to Type of Welding.

(2) remove interior oxide skin, oil, rust, water and other dirt of 30mm scope around the place to be welded, and use the acetone wiped clean.

(3) tack weld adopts tungsten polar helium arc to dose The welding of corronil welding wire, wherein, the content ratio scope of copper and nickel is 75%: 25% by weight percentage, and welding current is 450A, and protective gas adopts pure helium, and flow is 15L/min, adopts diameter Tungsten electrode, the tack weld weld length guarantees that at 15mm the distance between two tack welds is 150mm.

(4) weld seam bottoming welding adopts not preheating of tungsten polar helium arc to dose Corronil welding wire welding method, wherein, the content ratio scope of copper and nickel is 75%: 25%, and welding parameter is: welding current is 450A, and protective gas is pure helium, and its flow is 15L/min, the tungsten electrode diameter In the welding process, electric arc is pointed to heat conduction ratio red copper one side faster, utilize electric arc edge heat that mild steel is melted, it is overheated to prevent, and reduce bath temperature by dosing the corronil welding wire, and improve the weld seam setting temperature, intensity, plasticity, prevent crackle and pore; And, electric arc is stopped slightly in joint mother metal red copper one side, and does not stop, to guarantee that root of joint fusion is good and to realize appearance of weld in mild steel one side.

(5) after backing run welded, employing not preheating of tungsten polar helium arc was also dosed Weld seam is filled in the welding of corronil welding wire, and corronil welding wire, protective gas and the standard parameter that welding is selected for use is identical with weld seam bottoming welding.

Claims (2)

1, a kind of thick-wall red copper and low-carbon steel dissimilar metal material non-prewarming welding method, be adopt output current greater than the direct current source of welding current of 500A with the tungsten polar helium arc of pure helium as protective gas, before welding, need perform following preorder work: with thick-wall red copper to be welded and mild steel finished edge; Remove interior oxide skin, oil, rust, water and other dirt of 30mm scope around the place to be welded, and use the acetone wiped clean, it is characterized in that comprising following welding procedure step:
1), tack weld, adopt tungsten polar helium arc to dose The welding of corronil welding wire, welding current 175~450A, protective gas are pure helium, and flow is 10~15L/min, and the tungsten electrode diameter adopts Tack weld length is 10~15mm, and the distance between two tack welds is 100~150mm;
2), weld seam bottoming welding, adopt not preheating of tungsten polar helium arc to dose The welding of corronil welding wire, welding parameter is: welding current 175~450A, protective gas are pure helium, flow 10~15L/min, the tungsten electrode diameter is In the welding process, electric arc is pointed to heat conduction ratio red copper one side faster, utilize electric arc edge heat that mild steel is melted, it is overheated to prevent, and reduce bath temperature by dosing the corronil welding wire, and electric arc stops slightly in joint mother metal red copper one side, and do not stop in mild steel one side;
3), after backing run welds, can adopt tungsten polar helium arc and dose Weld seam is filled in the not pre-thermal weld of corronil welding wire, and welding variables is identical with weld seam bottoming welding.
2, a kind of thick-wall red copper according to claim 1 and low-carbon steel dissimilar metal material non-prewarming welding method is characterized in that the content ratio scope of copper and nickel is 58~75%: 42~25% by weight percentage in the described corronil welding wire of selecting for use.
CNA2008100124174A 2008-07-22 2008-07-22 Non-prewarming welding method for thick-wall red copper and low-carbon steel dissimilar metal material CN101323039A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101885101B (en) * 2009-12-25 2012-11-07 中钢集团鞍山热能研究院有限公司 Method for welding casting red copper oxygen lance spray nozzle
CN103801805A (en) * 2014-01-21 2014-05-21 马鞍山马钢设备安装工程有限公司 Sleeve welding repair method in blast-furnace tuyere
CN104439646A (en) * 2014-10-30 2015-03-25 诸暨斯贝达机械有限公司 Method for welding copper and steel and application thereof
CN104607770A (en) * 2014-12-12 2015-05-13 诸暨斯贝达机械有限公司 Adding wire welding method of copper and steel and application
CN104708222A (en) * 2015-03-13 2015-06-17 南京宝泰特种材料股份有限公司 Red copper carbon steel composite plate defect repairing method
CN104708180A (en) * 2015-03-13 2015-06-17 南京宝泰特种材料股份有限公司 Red copper crucible welding method
US20160121422A1 (en) * 2014-10-30 2016-05-05 Zhuji Sibeida Machinery Co., Ltd Welding method for copper and steel and application thereof
CN108453350A (en) * 2018-02-22 2018-08-28 西安理工大学 A kind of welding method of copper and steel
CN109332859A (en) * 2018-12-20 2019-02-15 中国电建集团四川工程有限公司 High-energy igniter oil gun restorative procedure

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101885101B (en) * 2009-12-25 2012-11-07 中钢集团鞍山热能研究院有限公司 Method for welding casting red copper oxygen lance spray nozzle
CN103801805A (en) * 2014-01-21 2014-05-21 马鞍山马钢设备安装工程有限公司 Sleeve welding repair method in blast-furnace tuyere
CN103801805B (en) * 2014-01-21 2016-01-20 马鞍山马钢设备安装工程有限公司 A kind of tuyere medium jacket of blast furnace welding repair method
CN104439646A (en) * 2014-10-30 2015-03-25 诸暨斯贝达机械有限公司 Method for welding copper and steel and application thereof
US20160121422A1 (en) * 2014-10-30 2016-05-05 Zhuji Sibeida Machinery Co., Ltd Welding method for copper and steel and application thereof
CN104607770A (en) * 2014-12-12 2015-05-13 诸暨斯贝达机械有限公司 Adding wire welding method of copper and steel and application
CN104708222A (en) * 2015-03-13 2015-06-17 南京宝泰特种材料股份有限公司 Red copper carbon steel composite plate defect repairing method
CN104708180A (en) * 2015-03-13 2015-06-17 南京宝泰特种材料股份有限公司 Red copper crucible welding method
CN108453350A (en) * 2018-02-22 2018-08-28 西安理工大学 A kind of welding method of copper and steel
CN109332859A (en) * 2018-12-20 2019-02-15 中国电建集团四川工程有限公司 High-energy igniter oil gun restorative procedure

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