JPS58151993A - Flux cored wire - Google Patents

Abstract

PURPOSE:To provide a flux cored wire which is suitable for vertical welding with high heat input and is improved in welding performance, by packing powder consisting of specific ratios of CaF2, SiO2, TiO2, CaCO3, Al2O3, Cr, Ni, Mn, Fe in the wire. CONSTITUTION:Powder contg., based on the weight of the entire part of a wire, 0.5-10% CaF, 0.5-10% SiO2, 0.5-5% TiO2, 0.5-7% CaCO2, 0.5-7% Al2O3, 3- 15% Cr, 0.5-7% Ni, 0.5-7% Mn, and <=30% Fe is packed in the internal gap of a tubular casing of stainless steel, whereby a flux cored wire for electrogas arc welding of austenitic stainless steel is obtained. The weld metal having excellent properties free from deterioration in mechanical properties such as impact resistance, malleability and ductility is obtained by using such wire.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flux wire using austenitic stainless steel electrogas arc IIIK.

Conventionally, stainless steel arc ** has been performed by methods using coated arc welding rods, gas encapsulated arc welding using solid wire, unencapsulated gas arc welding, and submerged arc welding. These mm methods have drawbacks such as poor work efficiency, insufficient performance, and limited joint posture, etc. Rounding, erector) Illlll-ku welding methods are often performed.

However, when welding austenitic stainless steel using ereta togas arter welding*, porosity occurs in the weld metal, uneven bead formation, poor slag shape,
There are various problems such as arc instability and generation of large amounts of spatter.

The present invention was developed and completed with the aim of solving these OwJ problems, and its gist is as follows: In the stainless copper tubular casing, the weight ratio to the entire 11"l! IIK wire is: CaFl: 0 .S ~1 @ 4.5iQ1: a
, K ~1 @1! s TtO exposure: 0. S
~K*s CsCO5' O,! 1~? Regret, A-
ffOs' @-1~1-1Crgos~tsl, Ni
: 6L 5~7 *s klx* :aS~11
Austenitic stainless steel wire made of austenitic stainless steel filled with s% F.: 30 or less O powder for electric p-gas arc am.

Electrogas arc 11 using the 7 lux cored wire of the present invention [! In contact, the shielding gas is carbon dioxide tft
This is characterized by the use of a mixed gas of argon and carbon dioxide.

INDUSTRIAL APPLICABILITY The present invention is suitable for high-input vertical welding (1iIK), improves welding performance, and provides weld metal with excellent mechanical properties such as impact resistance and malleability that do not deteriorate.

Next, the effects of each component used in the filler of the flux-cored wire of the present invention will be explained.

1) CaF3 Lowers the melting point of the slag, increases the fluidity of the slag, and achieves smooth beads.

In addition, it vaporizes during welding, shielding the molten metal from the atmosphere, preventing Ns and OR from being mixed in the atmosphere, and providing the effect of preventing the generation of pores. O, S *If not rowed, the platform breaking action will be incomplete and 1
(If it exceeds Ill, the arc becomes unstable, so 05~l
・-.

810 Gives fluidity to lazily molten metal and slag, improves compatibility between molten metal and base metal, and improves bead appearance and shape. O
If it is less than s4, the action is insufficient and the effect is insufficient, and if it exceeds 10, the slag becomes too hard, impairing the releasability and causing a decrease in the impact resistance of the weld metal.

3) T10m Functions as an arc stabilizer and slag forming agent, and improves slag removability. If it is less than os', the peelability of the slag will be impaired and the arc will become unstable), and if it exceeds 1O, the amount of slag will be large and the viscosity of the slag will decrease, resulting in poor weld bead shape such as slag entrainment and undercuts. To become O,S~i.

−.

4) CaCO5 Lowers the bulk partial pressure of water in the molten metal by carbon dioxide gas, prevents hydrogen embrittlement, and improves the cracking resistance of the ** section.If it is less than 1 O,S-, it is ineffective, and if it exceeds 7 O, the slag Because it worsens fluidity and causes defective welding and deformation, it is set to O, S ~ 7.

5) Nu01 Kfl for increasing the freezing point of slag and improving the fluidity of slag
use Makyu Welding Metal Il! It has the effect of smoothing the surface. If O, S is less than 4, there is no effect, and if it exceeds 7, the melting point of the slag will rise, impairing the fluidity of the slag and worsening the bead shape.

6) Metal powder gold - Powders of Fe, Cr, Ni, Mn, etc. are used. The amount used depends on the stainless steel material being welded and the type of hoop that becomes the tubular casing.
It is also adjusted in terms of the strength, cracking resistance, corrosion resistance, porosity resistance, fluidity, etc. of the resulting weld metal.

The weight ratio of slacks to outer skin is in the range of 5 to 4 mm.

Next, the present invention will be explained in detail using Examples and Comparative Examples. - in the examples indicates weight.

(1) Manufacture of flux-cored wire 5US304L
A flux-cored wire with a diameter of 1.6 square meters was manufactured by cold roll forming using a stainless steel hoop as a wire sheath and a flux whose composition is shown in Table 1.

Table 1 Wire composition (Unit: 0) (2) Welding test material: 5US304, plate thickness: 12cm, 20W138cm,
The groove shape is loose) MJi! i4m, Omotekuma 1x tsmO
Using the base metals of V8 tip (Figure 1) and Xl5ll tip (Figure 2), under the welding conditions shown in Table 2, the torch angle with respect to the vertical direction is shown in Figure 3, and the angle with respect to the horizontal plane is shown in Figure 4. Vertical welding was performed using the wire vibration method at the angle f shown in .

The welding performance is shown in Table 2, and the composition and performance of the deposited metal are shown in Table 3.
Shown in the table.

As is clear from Tables 2 and 3, the examples have good bath welding workability, good bead appearance, excellent X-ray performance, and various performances such as tensile strength, bending performance, and corrosion resistance. . Manou welding heat value is 40,000J/rag~410,000J
/(?llll) Despite this, the impact value at low temperatures is high and good.

On the other hand, welding workability was poor in case 1 of the welding process, such as a large amount of spatter and slag being generated and poor arc stability. In addition, spatter and slag obstruct the replacement of the shielding gas supply and cause pores to be generated.As a result, the surface of the bead is not smooth and overlap occurs during ungoose cutting, resulting in a poor bead appearance.

In addition, in Ratio 2, the slag is hard and the releasability is very poor.
In the X-ray performance, entrainment of slag was observed, and the false impact value was poor.

As described above, the flux-cored wire of the present invention has excellent welding performance and no deterioration in mechanical properties, and is industrially useful.

[Brief explanation of the drawing]

In Figures 1 and 2, the shapes of the V-groove and
III side view, in the figure, 1': base metal 2: root gap 3: surface gap 4: weld metal 5 back copper contact 6, glass tape 7: sliding steel plate 8: 7-rudo gas supply port 9: welding torch lO: Flux-cored wire 11: Welding direction 12: Welding torch vibration direction 13: Cooling water population 14: Cooling water outlet Patent applicant Nippon Oil & Fats Co., Ltd., Takada Industries Figure 1 Figure 2 Figure 3 Figure 4 Figure procedure amendment (method) % formula %) l Indication of the case 1944 Patent original No. 164142 2 Name of the invention Flutter λ included) Rear 3, @Relationship with the case of the person who makes the correction Patent issuer Chiyoda, Tokyo Yurakucho 1-10, No. 5, Yurakucho, 1-10, Specification to be amended Oti @ 0 Sei 1 Kamekan-ya- 6, Contents of the amendment (1) Book 11s, page 1, happy proverb ll and page 11, page 11, happy 3 table. delete. (2) - Issho Shima Page III, line and happy line 11 and t) @,
Attached Table 3 and Table 88 are inserted here.

Claims (1)

[Claims] Stereo/less steel 011-shaped case Vanda O inside 119! II in terms of weight ratio to the whole wire, CaFl: 0. s ~ 1 @ sauce, lIO fable: (l I ~ 1 ・
嗟, Ti1t: (1,s ~il, Ca00s:
@S ~ Tewo, N LmOs: 6.5 ~ 1 Mo, Cr
: m Ni SS, Ni @, 5~? Regret, T
o: O1 range to 7 years, F pot: S. - Flux-cored wire for austenitic stainless steel Electrogas Arter II, filled with the following powders.