JPS5847950B2 - Illuminite coated arc welding rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coated arc welding rod that exhibits good welding workability as an illuminite type welding rod.

Illuminite-based coated arc welding rods have iron sand, illuminite ore, or rutile as the main coating material, and can be used in all positions except in special cases.

Therefore, it is one of the welding rods that is still widely used today.

In terms of coating material, this type of welding rod is in the middle between high iron oxide type and titania acid type, but from the viewpoint of welding workability, it is generally preferable to use a coating material close to titania acid type. It is said that it is best to use an illuminite welding rod.

This welding workability is one of the important performances along with weldability, and using a welding rod with poor workability will not only reduce work efficiency but also be extremely difficult to weld with slag entrainment, blowholes, cracks, etc. This may also lead to the occurrence of important defects.

Therefore, at welding sites where welding rods with good workability are desired, illuminite welding rods having a coating similar to the titania acid type are often used.

However, there is a limit to the improvement of workability only by adjusting the coating material to a certain extent, and there has been a desire for a welding rod that can provide even improved welding workability at welding sites where higher workability is required.

The present invention was achieved by focusing on the viewpoint that workability may be influenced not only by adjusting the coating material to some extent but also by the particle size of illuminite ore, iron sand, and rutile. The purpose of this study was to study the particle size of the coating materials of inoleminite ore, iron sand, and rutile, and to meet the demands, we sought to create an illuminite-based coated arc welding rod with better welding workability than before. The gist of the present invention that has achieved this is that one or both of iron sand or illuminite with a particle size structure of 105 to 250μ or 70% or more is added to the coating material in a proportion of 5 to 40% or 105 to 250μ. It exists in that it is an illuminite-based coated arc welding rod containing 5 to 30% of rutile with a grain size structure of 60 to 80%.

In addition, the particle size range of 105 to 250μ listed above and below passes through a 60 mesh JIS 28801 standard sieve, and 145
This refers to what remains in the mesh.

In the present invention, the grain size of iron sand or illuminite, or both, of 405 to 250μ accounts for 70% or more, because in this range the arc is soft and stable, and the base material of the weld metal This is because the penetration of the particles is good, the crater spreads sufficiently, and the transfer state of the droplets becomes spray-like, resulting in extremely excellent workability. If the grain size moves towards the coarse side, the welding workability will be affected by the intense arc, the weld metal will not fit well with the base metal, and the overall quality will be poor.On the other hand, if the other grain sizes move towards the finer side, the welding workability will deteriorate. Similarly, the crater spread becomes smaller, the arc becomes unstable, and the transfer of the droplets becomes drop-like, resulting in worse results.

The coating material should contain 5 to 40% of iron sand or illuminite or both of the above particle size range.
If it is less than 40%, there will be insufficient penetration and workability cannot be improved.
If it exceeds the above range, the arc becomes intense, so it was set in the above range.

In addition, the reason why rutile's particle size structure is 1105 to 250μ accounts for 60 to 80% is the same as the reason for the limitation for iron sand and illuminite, because extremely excellent workability can be obtained with particles in this range. It is.

This rutile should be contained in the coating material in an amount of 5 to 30%; if it is less than 5%, the arc becomes unstable, and if it exceeds 30%, the slag releasability deteriorates, so the above range was selected.

The present invention will be explained in detail based on Examples below, but the following description is just one example and does not limit the present invention, and any aspect that has the gist of the present invention will be described as a technical scope of the present invention. Needless to say, do not deviate from the scope.

Example Five types of iron sand (A-E)** and five types of rutile (F to J) having the particle size structure shown in Table 1 were prepared.

Based on the formulations shown in Tables 2 to 5, 100 types of coating materials (/16.■1 to ■25) were prepared, these coating materials were applied to mild steel core wires, welding rods were prepared, and vertical blanks were made. Welding workability was determined by the meat position.

Core wire used: 4. Oφ x 400m1rL Covering diameter: 6.25mm Test plate dimensions: 12t ) Spread of the crater (the larger the better), (4) Arc force (the stronger the better), (5)
Judgment is made for each item of the droplet transfer state (spray shape is good), and the overall workability of the valley items is evaluated as an overall evaluation score.
It was decided to score with a perfect score of 10 points.

In addition, raw materials A to J in Table 1 are A, F: Outside the scope of the present invention (slightly rough) .

~v}: Present invention B~ E, J: Outside the scope of the present invention (some details) represents.

The welding workability evaluation results are shown in Tables 6 to 9.

Invention products Shinobi ■7 to ■9, Scraps ■7 to ■9, Dirt ■7 to ■9,
Demon ■7 ~ ■9, 應■12 ~ ■14, Demon ■12 ~ ■14,
應■12〜■14, Fake■12〜■14, Blasphemy■17〜■1
9, 應■17〜■l9, 應■17〜■l9, 應■17〜
■19 (Hereinafter, 應■■■1 and (耘■1, trash■1, devil■
1, 應■ means 1.

) Welding rods coated with the coating material were judged to be fair or good in all five workability categories, and the overall evaluation score was 9.
．． All scores were high, ranging from 2 to 10.

應■■■■ Rutile from 1 to 5 has a coarse grain size (/l6
■■■■1: Iron sand or coarse illuminite cannot give a soft feel to the arc;
In case of ■1, the weld metal did not fit well with the base metal, and the overall evaluation score was quite low.

If the iron sand or illuminite of 6, 11, 16, or 16 is coarse, the arc cannot feel soft overall, and the weld metal The adhesion to the base material was also poor.

On the other hand, if the iron sand or illuminite of 10 of Rin ■■■ and 15 of scrap ■■■ has a fine grain size, the crater cannot spread sufficiently, and the state of droplet transfer becomes drop-like.
The workability was not fully satisfactory.

○■■■■2o~25 rutile has a fine grain size (/l6■■■■20 has coarse iron sand or illuminite, counterfeit ■■■25 has fine iron sand or illuminite), Overall, the state of droplet transfer is drop-like,
The power of the arc is also weak, 20 of magic ■■■, 24 of ■■■, ■
■■ No. 25 did not provide sufficient clearance for the crater, and was not satisfactory in terms of workability.

Furthermore, in Groups ■, Group ■, Group ■, and Group ■, if the amount of iron sand, illuminite, or rutile contained in the coating material is within the range of the present invention, and the particle size is within the range of the present invention, excellent workability can be obtained. It can also be confirmed that

Figures 1 to 4 illustrate the workability of welding rods coated with each coating material, which were scored as a comprehensive evaluation score as shown in Tables 6 to 9.As can be seen from these figures, the present invention The product shows excellent workability (overall evaluation score).

In order to improve the welding speed (=deposited metal amount/welding time) of these illuminite-based coatings, 5 to 40% of iron powder is added to the coating.
%, the same workability as in the present invention is obtained.

The reason for this limitation is that if the iron powder content is less than 5%, there is no effect of increasing the welding speed, and if it exceeds 40%, workability in an upright position decreases.

As described above in the examples, the illuminite-based coated arc welding rod according to the present invention exhibits excellent welding workability in all aspects, and can provide a welding rod with extremely good workability that cannot be obtained with conventional welding rods. This can be especially effective at welding sites where there are few skilled welders.

[Brief explanation of drawings]

Figures 1 to 4 illustrate the workability of welding rods coated with the respective coating materials, which were scored as a comprehensive evaluation score according to Tables 6 to 9.

Claims (1)

[Claims] 1 The particle size structure of 105 to 250μ is 70% in the coating material.
One or both of the above iron sand or illuminite
~40%, 105~250μ particle size structure 60~80%
An illuminite-based coated arc welding rod characterized by containing 5 to 30% of rutile.