JPH1147982A - Solid wire for welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease generation of spatter by specifying Fe as main component and adding specific amounts of As, Mn, Ti and Al. SOLUTION: The constitution is that Fe is specified as main component and, by weight, 0.2-0.5% (Ti+Al), 0.8-3.5 Al/Ti, <=2.7% (Si+Mn), and >=9% 4(Si+Mn)+5(Ti+Al)} are included. The action of Ti controls arc length, and when the amount of Ti is too small the amount of spatter owing to short circuit increases, and when the amount of Ti is too much the droplet becomes too big and the amount of big grained spatter increases. Al has not only an effect on the action of Ti, but also has a relation to the viscosity of droplet and weld bead. When the amount of Al is too much, the breakaway of droplet becomes unsmooth, and when the amount of Al is too small the viscosity of bead becomes low and the shape of bead of horizontal fillet becomes deteriorated. In addition to the action of Ti and Al, Si and Mn, similar to Al, have relation to the viscosity of droplet and weld bead. Thus, arc becomes stable and an excellent result of welding in the shape of bead is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid wire for welding which has excellent arc stability and can reduce spatter.

[0002]

2. Description of the Related Art A welding solid wire generally used for gas shielded arc welding contains 0.05% carbon (C).
%, Silicon (Si) 0.70%, manganese (Mn) 1.60%, aluminum (Al) 0.002%, titanium (Ti) 0.18%, the balance being iron (Fe) and inevitable It is a solid wire for welding which is an impurity of which the reduction of spatter is the biggest problem. Therefore, a mag welding method using a mixed gas of argon and carbon dioxide gas as a flux-cored wire or a shielding gas in which the amount of spatter generated is about half has been practically used to reduce spatter.

[0003]

However, since gas cost and wire cost are higher than carbon dioxide arc welding using solid wire, it cannot be said that it is adopted in all markets where reduction of spatter is desired. is the current situation.

For this reason, carbon dioxide gas is used as an inexpensive solid wire, and the amount of spatter is about the same as that of a flux-cored wire or a mag welding using a mixed gas of argon and carbon dioxide as a shielding gas, that is, about half of the conventional one. The problem was to reduce to sputtering. An object of the present invention is to eliminate the above-mentioned conventional disadvantages.

[0005]

In order to achieve this object, the present invention comprises iron (Fe) as a main component, Si, Mn, T
i, a wire to which Al is added, and the
Al is 0.2% to 0.5%, and Al / Ti is 0.8 to 3%.
5, Si + Mn is 2.7% or less, 4 (Si + Mn) +5
(Ti + Al) contains 9% or more.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The above construction is based on the fact that elements such as Ti, Mn, Al, and Si, which are considered to control the arc length, droplet and bead viscosity, are focused on, and various components are changed. The welding wire No. shown in 1). 1 to 29 were subjected to welding tests under the conditions shown in (Table 2).

[0007]

[Table 1]

[0008]

[Table 2]

FIG. 1 shows the results when Ti and Al are changed, and FIG. 2 shows the results when (Ti + Al) and (Si + Mn) are changed. And Ti, A which is a deoxidizing element
Improving welding by adjusting the amount of l, Mn, Si,
In particular, it has been found that the amount of spatter generation can be reduced.

The abscissa of FIG. 1 shows the content of Ti (% by weight), and the ordinate shows the content of Al (% by weight). Line I in the figure indicates that the content of (Ti + Al) is 0.2%. %, The content of (Ti + Al) is 0.5% by weight, the value of Al / Ti is 3.5% by weight, and the value of Al / Ti is 0.2%. 8% by weight. When the abscissa axis of FIG. 1 in which the Ti content is described is set to the lower side, the bead shape is poor below the line I because the content of (Ti + Al) is small, and the upper part of the line II is (Ti + A) above the line II.
Since the content of l) is large, the amount of large-grain spatter is large, the arc becomes unstable above the line III because the Al / Ti value is large, and the spatter is large below the line IV because the Al / Ti value is small. In the range surrounded by these lines I to IV, the desired good result was obtained with less spatter (the present invention No except for the reference example and the conventional example).

Although the function of Ti and Al is not clear, it is considered that the arc length of Ti is controlled.
If the amount is too small, the amount of spatter due to a short circuit increases.

It is considered that Al not only affects the function of Ti, but also relates to the viscosity of droplets and beads. If the amount is too large, the detachment of the droplets will not be smooth, and the spatter due to arc instability will increase. If the amount is too small, the viscosity will decrease and the bead shape of the horizontal fillet will deteriorate. Thus, from FIG.
It can be seen that good welding results were obtained in the range of 5% by weight and Al / Ti in the range of 0.8 to 3.5% by weight.

Next, the horizontal axis of FIG. 2 shows the content (% by weight) of (Si + Mn), and the vertical axis shows the content (% by weight) of (Ti + Al). %, (VI + 0.5% by weight), (Line VII) = (Si + Mn) 2.7% by weight, and (Line VIII) 4 (Mn + Si) + 5 (Ti + Al) = 9%.
% By weight. When the horizontal axis indicating the content of (Si + Mn) in FIG. 2 is set downward, the bead shape is poor below the line V because the content of (Ti + Al) is small, and above the line VI is (Ti + Al). Is large, large spatters are large, and the right side of line VII is (Si + M
Since the content of n) is large, spattering is large, and the value of 4 (Si + Mn) +5 (Ti + Al) on the left side of the line VIII is small, so that the bead shape is poor. In the range surrounded by these lines V to VIII, good results were obtained with less spatter (No. of the present invention except for the reference example and the conventional example).

The interaction between Si, Mn, Ti and Al is not clear, but in addition to the above-mentioned functions of Ti and Al,
i and Mn are considered to be related to the viscosity of the droplet or the bead as in the case of Al. If the amount is not an appropriate amount and is too small, the viscosity becomes low and the bead shape of the horizontal fillet deteriorates, and at the same time spatter increases. If too much, spatter increases.

As described above, the present invention Nos. 4 and 7 in Table 1
8, 9, 10, 12, 15, 16, 19, 20, 23,
In Nos. 24 and 25, good results were obtained in spatter generation amount, arc stability and bead shape. Reference Example No. 1
Was poor in bead shape because the amount of (Ti + Al) was small. Nos. 2, 3 and 5 had high spatters due to small Al / Ti values. In Nos. 6 and 11, the arc was unstable because of a large Al / Ti value, and the spatter was large. N
In o13, 27 and 28, the amount of large grains was large due to the large amount of (Ti + Al). No. 14, 18, 22 is 4
The bead shape was poor because the amount of (Si + Mn) +5 (Ti + Al) was small. Nos. 17, 21, and 26 are (S
Since the amount of (i + Mn) was large, spatter was large.

[0016]

As described above, the solid wire for welding according to the present invention is excellent in that it is possible to obtain a welding result with less spatter, stable arc and excellent bead shape in gas shielded arc welding using the same. It has the effect that it has.

[Brief description of the drawings]

FIG. 1 is a Ti-Al characteristic diagram of a solid wire for welding according to an embodiment of the present invention.

FIG. 2 shows (Ti + Al)-(Si) in the embodiment.
+ Mn) Characteristic diagram

Claims (1)

[Claims] An iron (Fe) as a main component and a silicon (S)
i) a solid wire for welding to which manganese (Mn), titanium (Ti), and aluminum (Al) are added;
0.2% to 0.5% of Ti + Al by weight, Al / T
i is 0.8 to 3.5, Si + Mn is 2.7% or less, 4
Solid wire for welding containing (Si + Mn) +5 (Ti + Al) 9% or more.