JPH02280992A - Al alloy filler metal for welding of al-si alloy material - Google Patents

Abstract

PURPOSE:To form the finer solidified structure of a weld zone and to eliminate weld detects, such as weld cracks, by welding the above material by the alloy contg. specific ratios of Si, V, Ti, B, Zr, Mg, Cu, Mn, and Cr and consisting of the balance substantially Al. CONSTITUTION:The Al-Si alloy material is welded by the Al alloy filler metal for welding which contains, by weight % of respective components, 1 to 13 Si, further, contains 0.05 or over in total of one or >=2 kinds of 0.005 to 0.5 V, 0.005 to 1 Ti, 0.001 to 0.2 B, 0.01 to 1.5 Zr, and further contains one or >=2 kinds of 0.1 to 7 Mg, 0.1 to 7 Cu, 0.05 to 1.5 Mn, and 0.01 to 0.5 Cr, and consists of the balance substantially Al. The finer solidified structure of the weld zone is formed and the weld defects, such as weld cracks, are eliminated; in addition, the joint strength is improved as well.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is applicable to Al alloy filler materials, particularly Al alloys used for welding ρ-3i alloy castings and 4000 series Al wrought materials to Al-Si alloy materials. Regarding filler metal.

Conventional technology and problems For example, AC4 is used for joints of aluminum alloy stepladders, etc.
Al-Si alloy casting materials such as C are sometimes used by welding, but conventionally, 40431! Alloy filler metal was used.

By the way, Al--St alloy casting materials have a coarse structure and often have cavities, gas holes, etc. For this reason, when such materials are welded using 4043Al alloy filler metal, welding defects such as blowholes and cracks often occur. Weld defects such as weld cracks occur not only in cast materials but also in Al-St alloys.
A similar problem occurred when welding the wrought material of the 00 series Af1 alloy.

This invention was made in view of such circumstances, and
The object of the present invention is to provide an Aρ alloy filler material that does not cause defects such as weld cracks when Al-Si alloy materials are welded.

Means for Solving the Problems The above object contains Si: 1 to 13.0w1% and further V: 0. 005~0. 5wt96,T
i:0,005-1. 0wt%, B: 0. 00
1-0°2wt%, Zr: 0.01-1. 5w
t% of one or more types in a total amount exceeding 0.05vt%, or further contains Mg: 0. 1-7.
0wt%, Cu: 0. 1-7. 0wt%,
Mn: 0.05-1.5 wt%, Cr: 0.
01 to 0.5 wt% of one or more types, with the remainder consisting of Aρ and unavoidable impurities.
This is achieved using A2 alloy filler metal for welding 00 series Al alloy materials.

The significance of adding each element contained in the filler metal and the reason for limiting the range of addition will be explained.Si is effective in reducing weld cracking. That is, the low melting point eutectic component fills the grain boundaries and reduces weld cracking. However, if it is less than 1 νt%, it will not have this effect and the weld cracking sensitivity will become sensitive, potentially causing weld cracking. On the other hand, if it exceeds 13.0 wt%, the moldability of the filler metal deteriorates. Particularly preferable Si
The content range is 4 to 10 wt%.

VSTi, B, and Zr all contribute to the prevention of weld cracking by refining crystal grains. In terms of such effects, these are evaluated as equivalent to each other, so it is sufficient that at least one type is contained. However, V is 0.0
05wt% and Ti is less than 0.005wt% and B
is less than 0°001wt% and Z' is less than 0.01wt%, the above effects are poor.Also, when the total content of V, Ti, B, and Zr is 0.05wt% or less, the above effects are similarly poor. On the other hand, when V exceeds 0.5 wt%, processability is inhibited, and when Ti exceeds 1.0 wt%,
If B exceeds 0.2wt%, the toughness will be inhibited, and if B exceeds 0.2wt%
If the
Furthermore, if Zr exceeds 1.5 wt%, the grain size will vary and processing will become difficult. Particularly preferable contents are V: 0.01-0.3 wt%, Ti: 0.01-0.01 wt%
068wt%, B: 0. 005～0゜15wt%
, Zr: 0. 1-1. It is 2wt%.

In addition to the above essential elements, Mg5C may optionally be included.
u% Mn and Cr both contribute to improving the strength of the filler metal itself and ultimately of the welded joint. In terms of such effects, M g s Cu SM n sCr can be evaluated as equivalent to each other. However, Mg is O, lwt
% and Cu is 0, less than lwt% and Mn is 0.05
When Mg is less than 0.01wt% and C is less than 0.01wt%, the above effect is poor, and conversely, when Mg is more than 7.0w1% or Cu
is more than 7.0wt%, or Mn is more than 1.5vt%, or Cr is more than 0. If it exceeds 5 wt%, processability will deteriorate. Particularly preferable content range is Mg: 0°3~
6 wt%, Cu: 0.3 to 6 wt%, Mn: 0°1 to 1.2 wt%, Cr: 0.05 to 0.3 wt%
It is.

The method for producing the filler material according to the present invention is not particularly limited, and any conventional method for producing the filler material may be adopted as appropriate. However, if the amount of added Z is large, it becomes difficult to manufacture by continuous or semi-continuous casting according to conventional methods, and special manufacturing methods that are characterized by the production of alloy materials containing high Z are difficult. For example, JP-A-61-37315
It is necessary to employ a pressure coagulation extrusion method as shown in the above publication. The filler metal is generally used as welding rods and electrode wires with diameters and tolerances specified in JIS23232.

Although the filler material according to the present invention is used for welding Al-Si alloy materials, it is not necessary that all the members to be welded be Al-Si alloy materials, and Al-8
It is also possible to weld an i-based alloy material and another alloy-based material. Furthermore, even if the Al-Si alloy material is a cast material, the
It may be a 00 series Al expanded material.

Effects of the Invention According to the aluminum alloy filler material according to claim 1, Al
When -8i alloy materials are welded, the solidified structure of the weld can be made finer, and weld defects such as weld cracks can be eliminated. As a result, the range of use of Aρ-St alloy materials as welded structural materials can be expanded.

Further, according to the Al alloy filler material according to the second aspect, in addition to the above-mentioned effects, joint strength can also be improved.

Example Next, this invention will be explained in detail.

[Left below] [Weld cracking test] Various filler metals with a diameter of 1.2 m and having the composition shown in Table 1 above,
MI using AC4C-F material with a thickness of 6rm as the base material
A G Hould craft cracking test was conducted.

The filler metal was manufactured according to a conventional method. In addition, test piece (1)
As shown in Figure 1, length (L): 250#1
111. Width (W): 200 m. Spacing between slits (1a) (ρ): 10 m.

(X): 40#, (Y): 10vMR. Note (2
) is a tab board. In the test, the crack length of the welded part (3) was measured when MIG welding was performed in the direction shown by the arrow (X) in the same figure under the following welding conditions, and the crack rate was determined.

Welding conditions> Welding current: 22OA Arc voltage: 27v Welding speed: 40ca+/win Shielding gas flow rate: 25 (1/min tests were performed three times each. The results are shown in Table 2.

[Tensile test] Two sheets of AC4C-F material with a thickness of 3 shoes were butted together, and filler metals (diameter 1.2s++) having various compositions shown in Table 1 were used in the same manner as above.
The butt portions were welded using the following conditions, and the tensile strength and elongation of the joints were measured.

Welding conditions Welding method: MIG welding Welding current: 180A Arc voltage: 22v Welding speed: 60cm/min Shield gas flow rate: 20g/min The results are also shown in Table 2.

[Leaving space below] As is clear from the above results in Table 2, when Aρ-St alloy casting materials are welded using the filler metal according to the present invention, weld cracking is less likely to occur and the strength of the welded joint is extremely high. I know it's good and worth it.

In addition, weld cracking tests were carried out in exactly the same manner as above except that JIS4343 wrought material was used instead of AC4C cast material.
When a tensile test was conducted, it was found that the use of the filler metal of the present invention resulted in less weld cracking and superior weld joint strength.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of a weld crack test piece. that's all

Claims (2)

[Claims] (1) Contains Si: 1 to 13.0 wt%, and further contains V:
0.005-0.5wt%, Ti: 0.005-1.0
wt%, B: 0.001 to 0.2 wt%, Zr: 0.0
1 to 1.5 wt% of one or more types in total of 0.0
An Al alloy filler material for welding an Al-Si alloy material, characterized in that the content exceeds 5 wt%, and the remainder consists of Al and unavoidable impurities. (2) Contains Si: 1 to 13.0 wt%, and further contains V:
0.005-0.5wt%, Ti: 0.005-1.0
wt%, B: 0.001 to 0.2 wt%, Zr: 0.0
1 to 1.5 wt% of one or more types in total of 0.0
Contains more than 5 wt%, and further contains Mg: 0.1 to 7.0
wt%, Cu: 0.1 to 7.0 wt%, Mn: 0.05
-1.5 wt%, Cr: 0.01 to 0.5 wt%, one or more types, and the balance consists of Al and unavoidable impurities. Filler metal.