JPH04319074A - Semiautomatic arc welding method and its guide - Google Patents

Abstract

PURPOSE:To always maintain welding wire extension constant and to make welding quality uniform even if a worker is not a skilled person and a footing is unstable. CONSTITUTION:In semiautomatic arc welding where a welding wire W is supplied automatically via a welding torch T, a welding guide A to maintain the distance between the welding torch T and materials H to be welded constant is fitted to the above-mentioned welding torch T and in a state with the welding guide A brought into contact with the above-mentioned materials H to be welded, the welding torch T is moved to perform welding. In addition, the welding guide is formed of a ring 1 to come in contact with the materials H to be welded, an arm 2 which locates and supports the ring 1 in front of the welding torch T tip and a fitting part 3 which brings a center line of the above-mentioned ring 1 in line with a locus of the welding wire W and fits the above-mentioned arm 2 to the welding torch T.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method and guide for semi-automatic arc welding, and more particularly to a welding method and guide for semi-automatic arc welding in self-shielding using flux-cored welding wire.

0002

[Prior Art] In general, semi-automatic arc welding includes gas-shielded arc welding, in which the welding wire is shielded with gas, and self-shielded arc welding, in which a flux-cored welding wire is used, and as shown in Figure 10, a consumable electrode is used. The welding wire W is automatically supplied to the workpiece H via the welding torch T, and the operator manually performs straightening and weaving operations to move the welding line along the joint.

When performing semi-automatic arc welding, it is most important to always keep the protruding length of the welding wire W constant, that is, the length protruding from the tip of the welding torch T, in order to ensure welding quality. It is. This welding wire W is automatically fed to the workpiece H through the welding torch T.
The worker is constantly pushed away from the workpiece H by the reaction force of the arc force, and the operator must maintain a constant distance between the welding torch T and the workpiece H against this reaction force. There must be. In particular, at the time of arc start, the solid welding wire W collides with the workpiece H, so the reaction force is large. Therefore, the operator should fix the welding torch T by placing the arm holding the welding torch T on the side of the body or the side of the foot, or by standing it on the knee, and adjust the protrusion length of the welding wire W. was held constant.

[0004] Furthermore, in the case of semi-automatic arc welding, especially self-shielded arc welding, the protrusion length of the welding wire W is long, and varies depending on the type of welding wire W, but is 2 to 3 times long.
It is difficult to visually measure the distance between the tip of the welding torch T and the object to be welded H to make it constant, as some distances can be as large as inches. For this reason, an insulating guide having a shape similar to a nozzle is sometimes attached to the tip of the welding torch T to make it easier to keep the protruding length of the welding wire W constant.

[0005]

However, the above-mentioned conventional technology has the following problems. To fix the welding torch by placing the arm holding the welding torch on the side of your body, the side of your foot, or on your lap, and keep the protruding length of the welding wire constant by visual measurement. This requires considerable skill, and welding quality varies depending on the operator. Furthermore, the insulated guide attempts to keep the protrusion length of the welding wire constant under any conditions, and even when this guide is used, the welding torch must be operated in a floating position, so operating the welding torch requires skill.

On the other hand, while it is possible to secure stable scaffolding at work sites indoors, that is, in factories, it is difficult to secure stable scaffolding at work sites outdoors, and as mentioned above, It may not be possible to use the feet to secure the welding torch. Even under these conditions, various types of welding such as butt welding and fillet welding must be performed, and in particular, it is necessary to keep the protruding length of the welding wire constant while performing weaving operations such as welding on curved parts. This is an extremely difficult technique, and it is difficult for even skilled workers to achieve uniform welding quality.

The present invention has been made in view of the above-mentioned problems, and it is possible to maintain a constant protrusion length of a welding wire and to make welding quality uniform even if the operator is not an expert or the scaffolding is unstable. The aim is to provide a welding method and guide for semi-automatic arc welding that can be performed.

[0008]

[Means for Solving the Problems] In order to solve the above problems, the present invention is constructed as follows. In semi-automatic arc welding, where the welding wire is automatically fed through the welding torch,
Semi-automatic arc welding in which a welding guide that maintains a constant distance between the welding torch and the object to be welded is attached to the welding torch, and the welding torch is moved and welded while the welding guide is in contact with the object to be welded. This welding method was used.

[0009] The present invention also includes a ring that contacts the object to be welded, an arm that is positioned in front of the tip of the welding torch to support the ring, and a center line of the ring that is aligned with the trajectory of the welding wire so that the arm is connected to the welding torch. This is a welding guide for semi-automatic arc welding, consisting of a mounting part to be attached to the

0010

[Function] According to the present invention, it works as follows. Since welding is performed with the welding guide in contact with the object to be welded, the distance between the welding torch and the object to be welded is always constant, and the protruding length of the welding wire can be made constant. Therefore, uniform welding quality is possible.

Furthermore, by forming the tip of the welding guide that contacts the object to be welded into a ring, the distance between the welding torch and the object to be welded can be kept constant no matter which part of the circumference comes into contact.

0012

[Embodiment] An embodiment of the present invention will be explained based on the drawings. Figure 1 of the drawings is a perspective view of the welding guide, Figure 2 is a front view of the welding guide, Figure 3 is a sectional view taken along line III-III in Figure 2, Figure 4 is an explanatory diagram of butt welding using the welding guide, and Figure 5 is a Explanatory diagram of fillet welding using a welding guide, Figure 6
is a front view of another welding guide, and FIG. 7 is VII-VI of FIG.
8 is a front view of another welding guide, and FIG. 9 is a sectional view taken along line IX-IX in FIG. 8.

As shown in FIG. 1, the semi-automatic arc welding of this embodiment is self-sealed arc welding using a flux-cored welding wire W, and the welding wire W is automatically fed to the workpiece H through a welding torch T. The welding torch T is provided with an insulating welding guide A that maintains a constant distance between the tip of the welding torch T and the workpiece H.

As shown in FIGS. 1 to 3, the welding guide A includes a ring 1 that contacts the workpiece H, an arm 2 that supports the ring 1 by positioning it in front of the tip of the welding torch T, and a ring 1. The arm 2 is attached to the welding torch T with the center line of the welding wire W aligned with the trajectory of the welding wire W. This welding guide A has a cage shape with the center of the tip side of a cylinder cut out, and a ring 1 and a cylindrical mounting part 3 are connected by two arms 2, and the arms 2 are arranged to face each other. . Three arms 2 as shown in Figs. 6 and 7 or four as shown in Figs. 8 and 9 may be used, but as long as the steel properties of the welding guide A are maintained, the fewer the arms, the better the field of view. This is good from the standpoint of sputter adhesion.

A fixing bolt 4 is provided on the mounting portion 3, and the mounting portion 3 is fitted onto the portion where the contact tip C, which has a diameter larger than the tip of the welding torch T, is located, and the fixing bolt 4 is tightened. Thus, the welding guide A is fixed to the welding torch T. Thereby, it can be easily attached to a commercially available welding torch T. Alternatively, a threaded portion may be formed on the outer periphery of the tip of the welding torch T where the contact tip C is located, and a threaded portion may be formed on the inner periphery of the mounting portion 3 to provide a screw-in type.

The welding guide A has a ring 1 at its tip that contacts the workpiece H, so that it can be used anywhere on the circumference of the ring 1 in butt welding as shown in FIG. 4 or fillet welding as shown in FIG. Even if the parts touch, the distance between the tip of the welding torch T and the workpiece H can be kept constant. In other words, if the tip part is not ring 1, but has two legs, for example,
In butt welding, in order to prevent the legs from falling into the butt part, the two legs must straddle the butt part, and the distance between the tip of the welding torch T and the workpiece H to be stably kept constant. I can't. Moreover, when performing a weaving operation, it is necessary to perform the operation without removing the two legs from the object to be welded H, which is extremely difficult.

Next, the function of the welding guide A and the welding method will be explained. A welding guide A is attached to a welding torch T, and with the welding guide A in contact with a workpiece H, the welding torch T is moved to perform welding. In detail,
Ring 1 of welding guide A located ahead of welding torch T
is brought into contact with the workpiece H to be welded. Since there is a reaction force of the arc,
Against this, the welding torch T is pressed toward the workpiece H to bring the ring 1 into contact with the workpiece H. In this state, welding is performed by moving the welding torch T and performing operations such as straightening and weaving. By welding with the welding guide A in contact with the workpiece H, the distance between the tip of the welding torch T and the workpiece H can be kept constant, and the protrusion of the welding wire W can be kept constant. It is easy to maintain a constant length. Therefore, even in work sites such as outdoors where stable footing cannot be secured, uniform welding quality can be achieved even by unskilled workers.

[0018] Also, a welding guide A that comes into contact with the object to be welded H
By forming the ring 1 at the tip of the welding wire W, the protrusion length of the welding wire W can be reliably kept constant even when straightening or weaving operations are performed in butt welding, fillet welding, etc. Furthermore, if welding conditions are different, by preparing guides A with different diameters of the ring 1 and different lengths of the arms 2, welding quality can be maintained under any welding conditions.

[0019]The present invention is also very useful in applications such as self-shielded arc welding, where the range of suitable welding conditions is narrow and control of the protruding length of the welding wire W is particularly important.

[0020] The present invention is not limited to the above embodiments, but
For example, the welding guide may be shaped like a substantially conical cage,
The arm may be curved or spiral.

[0021]

[Effects of the Invention] Since the present invention is constructed as described above, it has the following effects. By performing welding with the welding guide in contact with the workpiece, the protruding length of the welding wire is always constant, so you can operate the welding torch floating or use your armpit or foot to fix the welding torch. Furthermore, there is no need to visually measure the protruding length of the welding wire. Therefore, even unskilled workers can achieve uniform welding quality even at outdoor work sites where the footing is unstable.

Furthermore, by making the tip of the welding guide that comes into contact with the workpiece into a ring, the distance between the welding torch and the workpiece can be kept constant no matter which part of the circumference comes into contact with the welding guide. Therefore, the protruding length of the welding wire can be made constant regardless of the weaving operation or the like.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a welding guide according to an embodiment of the present invention.

FIG. 2 is a front view of a welding guide according to an embodiment of the present invention.

FIG. 3: III-II of FIG. 2 according to the embodiment of the present invention
It is a sectional view taken along the I line.

FIG. 4 is an explanatory diagram of butt welding using the welding guide according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram of fillet welding using the welding guide according to the embodiment of the present invention.

FIG. 6 is a front view of another welding guide according to an embodiment of the present invention.

FIG. 7: VII-VII of FIG. 6 according to the embodiment of the present invention.
FIG.

FIG. 8 is a front view of another welding guide according to an embodiment of the present invention.

9 is a sectional view taken along the line IX-IX in FIG. 8 according to the embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

A, A1, A2: Welding guide C: Contact tip H: Object to be welded W: Welding wire T: Welding torch 1: Ring 2: Arm 3: Mounting part 4: Fixing bolt

Claims (2)

[Claims] 1. In semi-automatic arc welding in which welding wire is automatically supplied via a welding torch, a welding guide for maintaining a constant distance between the welding torch and the workpiece is attached to the welding torch, and the welding guide is connected to the A welding method for semi-automatic arc welding, characterized in that the welding torch is moved and welded while in contact with the workpiece. 2. A ring that contacts the object to be welded, an arm that is positioned in front of the tip of the welding torch to support the ring, and a center line of the ring that is aligned with the trajectory of the welding wire so that the arm is connected to the welding torch. A welding guide for semi-automatic arc welding, characterized in that it consists of a mounting part to be attached to.