JPS63501488A - Root insert and welding method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Root insert and welding method Le Milk α Light” The present invention relates to welding systems formed between structural members, particularly structural members made of high alloy steel. The present invention also relates to a root insert for a w4 structure. It relates to methods of welding together structural members made of materials, especially high-alloy steel. Therefore, in this method the weld root is formed first and subsequent layers of the weld seam are laminated. It will become a monkey.

Peel Hill @ Inunami As is known, when welding structural members to each other, a weld root is formed There are many difficulties that must be taken into account when constructing structural members to be welded together. Burning or burning out, collapse of the weld root and rupture of the weld root on the other side of the weld seam. Many techniques are required to avoid blinding or protrusions.

To reduce this risk, a backing plate is placed below the weld seam that forms on the root side. It was suggested to use gold or underlay. The backing metal material is the same as the base material. If so, they will dissolve somewhat along with the weld root and the backing metal can be removed later. do not have. This reduces the quality and aesthetics of the seam, and this method In use, the residue becomes a flow obstruction for the medium being passed through the tube. Sara However, the seam strength is often insufficient.

If the material of the backing metal is different from the material i+ of the structural members to be welded together, the backing metal does not dissolve together with these members. In this case, the role of the backing metal is to melt the weld. It is only to support the metal and avoid collapse of the root. however , It is really difficult to remove the backing metal after finishing the weld seal. this If this is not possible, as is often the case with pipes, the dowel may flow and form an obstruction. to create a spiral in the advancing medium. This causes deposits to form on both sides of the dowel. This area of the structural member is already highly stressed and degraded by welding. The corrosive effect is strengthened. In addition, you may not be able to clean the pipes with a pipe cleaner. cormorant.

The above-mentioned difficulties arise when mixing high-alloy steel, austenitic steel, stainless steel or acid-resistant steel. The difficulty becomes greater when welding. In these cases, it's known This will protect the weld seam that is formed from the harmful effects of the surrounding air. others A protective atmosphere is used during welding operations on structural members of this type, and this Qi is usually created by argon gas.

In the case of pipes, the pipes are evacuated with argon gas over the entire length of the pipe during all welding operations. Must be. This makes welding very difficult. Because the exhaust ( This is because the cleaning must be controlled at the same time as welding and constant during the entire welding process.

If the interruption of the protective gas flow occurs, for example, due to emptying of the gas container, If the exhaust becomes insufficient, for example due to a reduction in the strength of the gas flow, then Otherwise, if ambient air enters the pipe, welding must be stopped and the inside of the pipe must be evacuated. air and create sufficient gas flow in the tube, i.e. repeat all pre-orders several times. Must be done.

The material properties of structural members made of stainless steel or acid-resistant steel require temporary fixation of the members to each other. The so-called tack welding used to Ru. When the tack weld is re-welded, cracks or spills may occur in the tack weld. spots and thus the weld seam should be treated with great care in this area. Or formed with caution.

In the case of sensitive materials such as those mentioned above, the risk of combustion or loss of the material increases. vinegar Many techniques are available for forming welds in stainless steel or acid-resistant steel with controlled heat input. necessary, in which case the material is sufficiently dissolved but its disappearance is avoided. Sara In addition, the collapse of the weld seam is also avoided, otherwise the seam is even slightly I have to fix it. In the case of pipes, sections with defective weld seams are cut off. The cut end of the tube must be machined and measured as specified and this These tasks are not only time-consuming, ancillary, and difficult tasks, but also considerably This also results in material loss.

To Mitake 11 The purpose of the present invention is to eliminate the above-mentioned drawbacks and improve the welding root insert. by providing a method for welding with the help of this root insert. In this case, the shape of the weld seam is determined in advance and heat transfer to the structural members to be welded is determined. is adjusted during the welding operation so that a protective atmosphere for the high-alloy steel is maintained even on the root side of the structural member. is no longer needed, and the welding work is simpler and easier, and the quality of the seam is improved. Get better.

In the improvement of the root insert according to the present invention, the root insert has a root portion and a and a melted web connected to the root portion, with root surfaces on both sides of the web. (shou!ders), and the root surface is in the position where the root insert is seated. on the root side of structural members that are welded together in situ.

In a preferred embodiment of the invention, the root insert has a root insert on the opposite side of the web. A slag-forming coating layer is provided on the outer surface of the insert, the coating layer extends to a flat surface defined by the root surface.

In the relative dimensions of the root insert, according to the invention, the cold coating layer the root portion to web mass ratio is at least 2:8, and In the case of hot coating layers, the mass ratio of the root section to the web exceeds 3 near. It is preferable not to be able to do so.

In a preferred embodiment, the root insert is used to weld structural members. made of the same material as the welding electrode used and/or the material of the structural member itself.

An improvement in the method of welding structural members according to the present invention is that the welding route is root insert according to any one of claims 1 to 5; The insert is placed between the structural members to be welded, after which the weld root is inserted into the insert. It consists in being formed by melting a web of sheets.

In a preferred implementation, one of the root faces of the root insert is joint welded. on the root side of one of the structural members that insert the insert, and then the other structural member on the other root side of the root.

According to the invention, while melting the web of the root insert, the weld seam A first filling layer of is simultaneously formed in the form of a twin seam.

Finally, the shape of the web and the welding ratio of the root section to the web are welded. the material of the structure, the dissipation of heat by the structure, the properties and shape of the coating layer. A preferred implementation of the invention is when selected according to the quality of the welded seam. .

Brief description of the drawing The present invention will be described in detail based on preferred embodiments with reference to the accompanying drawings.

FIG. 1 shows a cross section of a root insert according to a preferred embodiment of the present invention. FIG. 2 is a diagram illustrating a preferred implementation of the method; FIG. 2 is a diagram showing a root weld formed using the present invention.

-8 of ゛ With reference to the drawings, the invention is illustrated by an embodiment of a tube made of high-base gold austenitic steel. explain. As is clear from FIG. 1, the ends of tubes 1 and 2 to be welded together are It is finished to the shape normally required for welding work. pipe 1 and pipe 2 In between, according to the invention, a root insert 3 is provided, in this case It has a ring shape. Root seam.

- The trunk 3 consists of a root section 4 and a web 5 connected thereto. More details later so that the root surface 6 is on the surface of the tubes 1 and 2 at the position where the root surface 6 is before welding. . Root surfaces 6 are located on both sides of the web 5 at the point of connection to the root portion 4 . Do it like this The root insert 3 is in the shape of an upside-down, stubby pine mushroom. Pine tree The handle of the shroom is the web 5, and the umbrella is the root portion 4. Its umbrella At the edge of the tube are the ends of tubes 1 and 2, as shown in FIG.

In this embodiment, both sides of the web 5 match the shape of the finishing tube end. child In certain cases, the root insert 3 is a tube 1 made of high-grade gold austenitic steel. and 2, so that the formed weld seam is kept away from the ambient air. It will be protected. According to the invention, this can be achieved with already known solutions. Prepare the slag-generating coating layer 7 by argon gas scavenging. This is solved by This coating layer 7 is applied to the root portion on the opposite side to the web 5. The outer surface of the portion 4 is covered up to the flat surface defined by the root surface 6. in this way Then, the end of the coating layer 7 extends from the root surface 6 on the root side of the tubes 1 and 2. Form a long part.

The coating layer 7 then also contacts the root sides of the tubes 1 and 2 and FIG. The seat of the root insert 3 as shown in Fig. 3 has a position where the surrounding air is kept from the root side. Slag on root insert 3 does not sneak into the weld seam under protection The material of the generated coating layer 7 should be the same as the material of the welding electrode used in welding. I can do it.

The coating layer 7 is essential for the quality of the material to be welded and the weld seam formed. Required only when needed. Of course, the route-in without a coating layer Cert 3 can also be prepared and used. However, the coating layer 7 , at the same time serves as a support for the weld seam during welding operations, especially for molten metal eliminate the risk of collapse. Therefore, the root insert with the coating layer 7 The use of method 3 is appropriate in this case as well; That may not be necessary.

In FIG. 2, a root seam 8 formed according to the invention is shown in cross section. This root seam 8 is in fact a twin seam; Strictly speaking, not only the seam root 9 but also the first filling seam layer 10 is formed. This is because that.

A preferred implementation of the method according to the invention is described below with reference to the use of the root insert 3 according to the invention. Explain by reading.

Before starting welding work, the ends of tubes 1 and 2 must be shaped to be suitable for normal welding. The ring-shaped root insert 3 must then be placed on the root side of the tube 1. The root surface 6 of the root insert 3 is on the surface and the web 5 is arranged radially outward. placed on the end of the tube 1 as shown in FIG. Next, the root side of the other pipe 2 is The tube 2 is placed on the root insert 3 so that it is on the other root side 6 of the root insert 3. placed next to each other.

During this time, the longitudinal axis of tube 2 is brought to a coaxial position with the axis of tube 1, so that tube 2 It is pressed against the root surface 6 in the direction. When you do this, the cylinders of tubes 1 and 2 A sharp edge is present along the entire circumference of the tubes 1, 2 between the root surface 6 and the web 5. this This also ensures that the tubes 1 and 2 are centered. The distance between the ends of tubes 1 and 2 is the entire circumference. This is guaranteed to be constant over the weld seam. This is an important point to note.

After placing the tubes 1 and 2 on the root insert 3, welding dissolves the web 5. It is started by If tubes 1 and 2 are pushed towards each other, tube 1 and how many of the 0 circumferences the reliable position on the root insert 3 of 2 remains constant At some point, the tubes 1 and 2 are temporarily fixed to each other by melting the web 5, so-called. Temporary fixing would not be necessary, but even if this temporary fixing were done , which would be different from conventional tack welding.

During the melting of the web 5, the root is also melted, which is protected from the inside by the coating layer 7. I can support you. The root portion 4 of the root insert 3 forms a seam root 9; At the same time, additional material for the first filled seam layer 10 is provided by the web 5.

The heat required for melting is transmitted through the web 5 and the tube end that rests on the root. heat The amount should be enough to melt all the ends and root seams 8 of tubes 1 and 2, and The coating layer 7 should be sufficient to form a sugura on the root sides.

Since heat transfer is mainly carried out through the web 5 and the tube end, the shape of the web 5 and the The mass ratio of web 5 to root section 4 is of particular importance. The main factors are tube 1 and and 2 heat dissipation, which may be different for the two tubes 1, 2. All of Regarding these factors, regarding the shape of the web 5 and the root portion 4 of the web 5, The mass ratio must be determined with great care. For example, a cold coating layer In this case, the mass ratio of web 5 to root section 4 is preferably at least 2:8. but when necessary the root portion 4 is smaller than the web 5, but , if a hot coating layer is used, this mass ratio is at most 3 near, i.e. That is, the difference between the mass of the web 5 and the mass of the root portion 4 is smaller; However, the web 5 is formed in accordance with the invention and has a thermal regulation function, and this allows the necessary heat transfer but prevents combustion of the material of tubes 1 and 2.

During welding, the coating layer 7 melts and forms a slag coating, which covers the seam under formation. protect it from the effects of the surrounding air. Therefore, the protective atmosphere on the root side is the most There is no need for sensitive materials at all.

Of course, the root insert according to the present invention is not only used for pipes. Welding seams of any shape and trajectory are possible with the aid of the root insert according to the invention. The root insert must always have the same shape as the weld seam. .

Based on experience and testing with the method of the present invention and root inserts as described above, It turns out that the purpose stated in the introduction can be achieved without any effort. moreover , to my great surprise, the root seam 8 is more beautiful than expected, the seam Most of the root 9 is melted into the root side of the structural member to be welded. weld seam This is very important in the case of tubes where no collapse or other deformation is observed; This is because the root seam cannot be finished in the pipe. adjacent surface The melted route does not impede the flow of material in the pipe; Thus, preparation in this respect is easier to achieve than before.

Fig, 2 Procedural amendment (formality) %formula% 1.Indication of the incident d/-6dl-1 PCT/HU86100052 2. Name of the invention Root insert and welding method 3. Person who makes corrections Relationship to the incident: Patent applicant Name: Betsy, Chava 4. Agent Address: Shizuko Toranomon Building, 8-10 Toranomon-chome, Minato-ku, Tokyo 105 Phone: 504 -07215, date of correction order 6. Subject of correction (1) Translation of the description and claims (2) Power of attorney 7. Contents of correction (1) Translation of the description and claims (no change in content) (2) As per attached sheet 8. List of attached documents (1) Translations of the specification and scope of claims (1 copy each) (2) Power of attorney and its translations (1 copy each) 1 letter international search report

Claims (9)

[Claims] 1. Route for weld seams between structural members, especially structural members made of high-alloy steel In the insert, said root insert (3) has a root portion (4) and a corresponding consisting of a dissolving web (5) connected to a root portion (4) and of said web (5). It has root surfaces (6) on both sides, and the root surfaces are at the seating position of the insert (3). The root tool is located on a root side of the structural member to be joined and welded at a location. Cert. 2. The root insert (4) has a root insert on the side opposite to the web (5). A slag-forming coating layer (7) is provided on the outer surface of the sert (4); The covering layer extends to a flat surface defined by said root surface. The root insert according to claim 1, characterized in that: 3. In the case of a cold coating layer, said root part (4) and said web (5) Claim 1 or Claim 1, characterized in that the mass ratio between Root insert described in item 2. 4. In the case of a hot coating layer, said root part (4) and said web (5) Claim 1 or 2, characterized in that the mass ratio of does not exceed 3:7. root insert. 5. the root insert is a welding electrode used to weld the structural member; and/or the same material as that of the structural member itself. The root insert according to any one of claims 1 to 4. 6. The weld root will be formed first, then the subsequent layers of the weld seam will be laminated In the process of welding structural members together, especially structural members made of high-alloy steel, Before forming the weld root, the root insert, in particular the The root insert according to any one of item 5 is added to the structural member to be welded. the welding route melting the web of the insert. A welding method characterized in that the welding method is formed by: 7. one of the root surfaces of the root insert of the structural member to be jointly welded; on one root side, after which the other structural member is placed on said root insert. 7. A method according to claim 6, characterized in that the method is on the other root surface of the. 8. While melting the root insert web, the first fill of the weld seam Claim 6, characterized in that the filling layer is simultaneously formed in the form of twin seams. or the method described in paragraph 7. 9. The shape of the web and the mass ratio of the root portion to the web are combined. the materials of the structural members welded together, heat dissipation through the structural members, coatings; It is characterized by being selected according to the characteristics of the layer and the quality of the weld seam formed. The method according to any one of claims 6 to 8.