KR790001378B1 - Overhead position arc welding method - Google Patents

Abstract

Overhead position arc welding method for using the coating consumption nozzle composed of the essential slag agent and the adequate degreasing and alloying agent, had characteristics that the nozzle (3) was fitted in the groove of the welding rod(1), nozzle melting speed-wire melting speed was 0.3-1.0, and the total deposition speed was higher than 200g/min.

Description

Arc "arc" welding method

1a, b are schematic views showing one example of the method according to the present invention.

TECHNICAL FIELD The present invention relates to a directional "arc" welding method, in particular, a directional "arc" welding method using a coated "nozzle".

Conventionally, the "electro slag" welding method using a consumable "nozzle" has been performed by the direction welding method. Since the welding speed is slow in this method, the heat input of the welding is large, so heat The mechanical properties of the affected part deteriorate. For this reason, if the gap is narrow, "arc" occurs around the groove and backing of the copper, so that it is difficult to perform a stable "electro slack" welding, and it is sufficiently infiltrated. It is also difficult to weld, and the "gap" must be widened, resulting in an increase in the groove cross-sectional area, and thus a decrease in the welding speed.

The same is true for thin plates (for thin slabs it is necessary to widen the "gap" because thin slabs require a "slack" bath of at least 25 mm). If it is narrow, the cooling speed of a slag bath will become high and it will be impossible to carry out stable penetration.

As a means to solve this problem, there is a method of increasing the current in order to increase the welding speed, but the "nozzle" itself by the limit of the "flux" amount and the "gap" width required for the formation of the "slack" bath. The size of the nozzle is limited (the thickness of the nozzle is limited, so that the "nozzle" is red, and welding with a large electric current is difficult. As a means of increasing the cross-sectional area of the "nozzle", In some cases, round bars are welded, but the groove gap must be increased, and therefore, the welding speed cannot be increased, and iron pieces are used instead of hollow nozzles. Although the method of making it is proposed, since the welding amount cannot be changed, there exists a problem in the precision of a "gap", and it is the present state that it is not put to practical use.

On the other hand, in addition to the "electro slack" welding method, an electro gas arc "welding method using a consumable" nozzle "has also been proposed. As a method of using" gas "together, a" gas "hole is formed by a" spatter ". Because of the blockage, coupling due to lack of "shield" occurs, or "nozzle" dimensions, shapes, wire shapes, and feeding speeds are not suitable even for directional "arc" welding. Since the gap is required and the wire feeding speed is also slow, the dissolution rate cannot be significantly improved.In addition, in the "electro slack" welding method, the penetration is insufficient due to the lack of heat input at the start of the welding. There is a drawback that it is easy to become short and does not apply to the long one in that the welding of the "slag" bath or the "gas" supply is always necessary and the "nozzle" is glowing.

The present invention solves the above-mentioned drawbacks and problems of the prior art, that is, a coating agent containing a suitable fragrance containing other deoxidizers and alloying agents with the "slack" agent as an essential component. Is installed in the groove, and the welding "wire" is continuously fed through the hole of this nozzle.

The value of (Nozzle Dissolution Rate) / (Wire Dissolution Rate) is

0.3-1.0 and the overall welding speed

To negotiate over 200g / min

Characterized by cloth consumption "nozzle" is a directional "arc" welding method.

In the present invention, a method of welding while feeding "wire" through a "nozzle" in a groove of a base metal to be welded, in particular, a melt ratio and a specific deposition amount of "wire" and "nozzle" The present invention will be described in detail below with the features of the present invention.

In the present invention, any of the improved shapes I-type, Y-type, V-type, and U-type may be used, but an I-type groove is preferable from the viewpoint of increasing the melting speed.

An example of the present invention will be described with reference to the drawings. Backings 5 and 5 are provided on both sides of a welded joint of the welded base material 1 and 1, and thus Insert a consumable " nozzle " (3) having a coating material (2) in the gap formed therein, and insert a flat " wire " (4) into this " nozzle " "Arc" is generated inside the wire) to perform in-plane welding, and a weld metal is filled into the groove line to complete welding by one time of welding. At this time, the long diameter of the "nozzle" can be changed according to the thickness of the plate, and it is not restricted by the thickness of the plate, and it does not need to swing the "nozzle" back and forth during welding. It is not necessary to attach a "flux" during welding, since the thickness of the coating can be changed appropriately according to the spacing. The coating agent of this nozzle is coated with a deoxidizer, an insulation agent, an alloy agent, and a "slag" agent with a suitable binder, and if the component is suitably selected and determined according to the target material, It is good to set the support material, the dimension, and the dimension suitably, and it is not specifically limited.

In the method of the present invention, the reason will be explained with respect to the fact that (nozzle melt rate) / (wire melt rate) -0.3-1.0 (referred to as sigma) and the overall welding rate is 200 g / min or more. That is, if the value of sigma exceeds 1.0, a certain amount of current is used since the "nozzle" cross-sectional area is large, but the current flowing directly from the "nozzle" to the welded base material increases, and the current flowing from the "wire" to the welded base material Thus, despite the increase in the nozzle melt amount, the wire melt rate decreases further, leading to a decrease in the welding rate as a whole. In addition, conventionally, the "nozzle" cross-sectional area has been increased. This means that the groove spacing must be increased, but it cannot be used for a thin plate, and a sufficient welding speed could not be expected. In addition, when σ is less than 0.3, the "wire" melt amount is considerably increased compared to the melt amount of the nozzle. Therefore, to increase the overall melt amount and to improve the welding speed, it is necessary to increase the feed rate of the wire. It becomes unavoidable. However, in this case, since the thickness of the "nozzle" is not so thick, it becomes difficult to weld a large current and the large current welding becomes difficult, and when (sigma) is 0.3 or less, sufficient welding speed cannot be made.

Next, if the overall welding speed is 200 g / min or less, for example, even if the value of sigma is in the range of 0.3-1.0, the welding speed will not be sufficient. Moreover, even if the whole welding speed is 200 g / min or more, if the value of (sigma) is outside the range of 0.3-1.0, this too will not produce sufficient welding speed.

In the present invention, even when a large current of about 900 A (amps) is used, the "nozzle" does not glow, and the nozzle may be circular or elliptical, for example, through a "wire" such as a balanced "nozzle". "Even if the cross-sectional area becomes large, there is no need to widen the gap. Therefore, the "gap" (gab) can be narrowed and a large current can be used, so that a very high welding speed and a "wire" and a melt rate of the nozzle can be obtained. In addition, stable current voltage can be obtained even in narrow grooves and high currents, so that the penetration situation, in particular, the welding initiation and the penetration angle of each groove is very good, and the "shield" of the molten metal is a "nozzle". There is no need to adjust the bath of the "slag" or to supply a "gas" during blast furnace welding with sufficient molten "slag" resulting from the coating applied to the coating. In addition, two methods have already been proposed as welding methods similar to those of the present invention.

One is submerged arc welding using a "consumer covered" nozzle, and the other is an "electro slag" welding method using a specially consumed "nozzle" with a large cross section. In these methods, either the value of sigma or the welding speed is satisfied, but both conditions cannot be satisfied at the same time as in the present invention. That is, in these two methods, for example, sigma is in the range of 0.3-1.0, the welding speed is good at less than 200 g / min, and when the welding current is increased to increase the welding speed, The problem of redness also arises. If the value of sigma is not lowered to less than 0.3, good welding is not performed.

An embodiment of the present invention will be described below.

As described above, this invention has the following effects.

(1) The welding speed is more than twice that of the conventional method, and the mechanical properties of the heat affected zone are very good.

(2) The "wire" feeding speed can be increased compared to the conventional method.

(3) Even if the "gap" is small, stable welding is obtained.

(4) No adjustment of the "slag" bath during welding is necessary.

(5) Penetration of each part of a "star art" part and a groove is favorable.

(6) The "nozzle" cross section does not have to be that large.

(7) The "nozzle" does not glow even with a high current.

(8) Thin and long bead is obtained.

Claims (1)

"Slack" is an essential ingredient, and the coating consumption and "nozzle" which apply | coated the coating agent containing an appropriate amount of other deoxidizer and alloying agent are groove | groove of a to-be-welded material. ), And the welding "wire" is continuously fed through the hole of this "nozzle", the value of (nozzle melt rate) / (wire melt rate) is 0.3-1.0, and the overall welding rate is 200 g / A vertical arc welding method using a coating-consumed "nozzle" characterized by welding under a condition of min or more.

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