DE1079428B - The use of a welding wire to produce a weld with high impact strength - Google Patents

Description

GERMAN

Often there is a need to produce a weld with a notched impact strength of about 10 mkg / cm ² and more at −20 ° C. on workpieces made of non-killed steel in a metal arc. Achieving a weld that meets these requirements poses considerable difficulties, however.

According to the knowledge on which the invention is based, however, this can be achieved by Use of a welding wire consisting of a steel of the composition

0.05 to 0.15 vol carbon,
1 to 3% manganese,
0.6 to 1.4% silicon,

The remainder is iron with the usual impurities of sulfur and phosphorus

For producing a weld with a notched impact strength of about 10 mkg / cm ² and more at -20 ° C on workpieces made of non-killed steel in a metal arc in a gas atmosphere of almost pure carbon dioxide.

Various of the measures to be observed here are known per se in whole or in a similar manner. So a welding wire intended for carbon arc welding contains up to about 0.45% carbon, 0.25% to 1%> silicon and 0.20 to 3% manganese. Apart from the fact that with this known welding wire no Solution of the aim of the present invention, the production of a weld with a large Notched impact strength is aimed for or achievable, according to the given specification, this welding wire is not intended for metal arc welding in a gas atmosphere of almost pure carbon dioxide. Since a carbon arc welding takes place in the air, there is always the risk of nitrogen from the air leads to nitriding of the weld. ....

If carbonic acid is produced by the oxidation of carbon in this welding process, too but what is crucial here is that it does not keep nitrogen away from the weld. This rule therefore gives no suggestion to produce a weld with a high impact strength to use the welding wire described above in a gas atmosphere of almost pure carbon dioxide, especially since the limits of the content of relevant substances in the wire for this special purpose to a certain extent Senses have to be chosen differently.

For the gas welding of soft carbon steels, a welding wire is also known, the 0.08 up to 0.12%. Carbon, 1.0 to 0.2%. Silicon, 0.9 to 1.3% manganese, some phosphorus and sulfur, and more still contains 0.9 to 0.25% molybdenum. With this gas welding in the oxygen-acetylene flame ent-Die Use of a welding wire

for making a weld

with high impact strength

Applicant:

NV Philips' Gloeilampenfabrieken,
Eindhoven (Netherlands)

Representative: Dipl.-Ing. H. Zoepke, patent attorney,
Munich 5, Erhardtstr. 11

Claimed priority:
Netherlands 7 May 1955

Paul Christiaan van der Willigen, Eindhoven

(Netherlands),
has been named as the inventor

represents hydrogen. This gas is highly detrimental Measure the quality of the welding result. No suggestions are to be taken from this regulation either, the welding wire in other types of welding process, especially in a gas atmosphere of to use almost pure carbon dioxide with the aim of achieving a weld with high impact strength, especially in this case, too, the percentages of the contents in the substances when used differently should be chosen differently, although there is some overlap.

Also known is a welding wire with up to 0.05% carbon, about 2 to 4% manganese and less than 1% silicon. The carbon content is too low here.

: With this welding wire, too, a weld with high notched impact strength becomes almost pure Carbon dioxide is neither aimed for, nor can it be achieved through it.

A wire with at least 0.3% manganese and at least 0.3% silicon is also known is to be welded in a gas atmosphere of carbon dioxide. However, this provision lacks any Indication of how the wire composition must be and under which circumstances the welding is carried out should be to make a weld with a

Notched impact strengths of about 10 mkg / cm ² and more at -20 ° C can be achieved on workpieces made of non-killed steel. In contrast, the invention provides a valuable addition to the art in this regard.

"909 769/307

Claims (1)

3 4 Using the marked welding and. 2 mm wide on the surface, so that a wire can be welded a deep I-seam, fracture area of 7X10 mm2 remained, but several welding beads can also be welded in one. Sharpy hammer with an output of 10 mkg creates a weld in each case, 5 of which are carried out. mechanical properties are comparable to the maximum quality achievable with a known method. It is also an advantage that the wire composition marked with + zuc protects against small amounts of 1, 14, 14, 2, 14, 14, 14, 4, 14.0 mkg / cm2, against impurities of the used Carbon dioxide on average 14 mkg / cm2; is not very sensitive, so that commercial, solid or liquid carbonic acid, which usually contains a few samples b) at -20 ° C cent air, is harmless with this method 1. 11.7, 2. 10.7, 3. 14.1 , 4. 14.1 mkg / cm2, can be used. average 12.7 mkg / cm2. As an example of the welding quality 2 that can be achieved when using the wire according to the invention. An unprepared butt weld of 3 mm is subsequently a weld and its test width between two plates made of 13 mm thick according to a pre-calibrated steel normalized in the Netherlands written on the underside as follows: completed that the plates on a 6 mm thick 1. Two mild steel plates of 400X100X16 mm 20 copper strips were placed. This seam was included under 350 beveled edges are placed in the middle of a wire 2 mm in diameter with a welding stand of 10 mm filled by fillet weld on a metal; the welding wire consisted of with Underlay strips of 450X5ÖX13 mm made of the same 1.6 "/ O 'manganese and 0.9% silicon alloyed iron, chen steel fastened; in the resulting width the 0.07% carbon, 0.02% sulfur and 0.02% V-seam is a weld bead using a 25 containing phosphor. For this purpose the end of the wire was melted down with a diameter of 2 mm the one made of iron with 0.07% carbon, 1.6% manganese, guided the seam walls and the wire a direct current 0.9% silicon, 0.02% sulfur and 0.02% phosphorus of 470 A supplied. The wire was doing this in a consists. The wire is melted down during welding at a speed of 5.7 m / min; Current of 475 A at an arc voltage of 30 when the end of the wire at a speed of of 34 V processed and at a speed of 40 cm / min, through which the seam would be moved, filled of 5 m / min, being fed to the positive pole of the latter completely with weld metal. Welding rectifier is connected. During the welding process, eight impact bars were produced Welding, 201 gaseous coals are cut per minute according to the first example, acid through a mouthpiece with a diameter of 15 mm, 35 The notch impact measured on these rods whose center point with the axis of the welding wire were toughness values: coincides in the welding arc and in its _a \ ^ _e j _ | _20 ° C blown in the immediate vicinity. The Vorbewe-, ₂ 11 <fi? 11 2 4 117mWrm ² The speed of movement of the end of the welding wire was ^{1- 1Ζ} ' ^Λ ^ ^{ii) D} ' ^{ό '11> 4} ' * '^{LL> / mK} S ^{/ cm} > 40 cm / min. In each case with interruptions of 20 minutes - 40 ^on average 11.8 mkg / cm ² , A total of eight weld beads were deposited b) at -20 ° C melted the seam completely with welding _{L g 5 2 10} 3 3 _{10 0 4 10} 3 _mkg / _cm 2 metal filled. . ,,. ,. _ _o . . " From this weld two round test ^{pieces were made in the middle 9} ' ⁸ ™ ^k & ^c ™ ² - bars twisted, 20 mm long at both ends to 45 15 mm are thickened, while the thin part 56 mm claim:
was long. The part of the Test rods had a diameter of 10 mm and the use of a welding wire, legs Length of 55 mm. standing out of a steel composition The experiment resulted in: 50 nne -unn ™ fli ± ä 0.05 to 0.15% carbon, Tensile strength 47.5 or 46.9 kg / mm ² 1 to 3% manganese, on average 47.2kg / mm ² _{Q6 big M} " _{/ (>silicon>} Yield point 38.0 or 37.3 _{remainder iron with the} usual impurities on average 37.6 _{55 genes in} sulfur and phosphorus Elongation 29.0 or 30.0% on average 30% for producing a weld with a notch Contraction 66 or 71% impact strength of about 10 mkg / cm ² and more on average 70% ^ ei ~ ^ 0 ° C on workpieces from unstilled 60 steel in a metal arc in a gas atmosphere On short rods, the notched impact strength became the sphere of almost pure carbonic acid. measured from 10 X 10 X 55 mm, which comes from the ■ welded plate in the direction perpendicular to the longitudinal. direction of the weld were cut out. German patent specifications No. 612 579, 721 385, A notch was made in the direction perpendicular to 65 958168; Surface of the plate attached from which the rods German Auslegeschrift No. 1 026 896; were cut out, the center 3 mm deep Swiss patent specification No. 270 895. © 909 769/307 3. € 0