CN102481652B - Angle brace welding point and preparation method thereof outside face - Google Patents

Angle brace welding point and preparation method thereof outside face Download PDF

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Publication number
CN102481652B
CN102481652B CN201080037246.6A CN201080037246A CN102481652B CN 102481652 B CN102481652 B CN 102481652B CN 201080037246 A CN201080037246 A CN 201080037246A CN 102481652 B CN102481652 B CN 102481652B
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gusset
substrate
leg
long
welding
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CN102481652A (en
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岛贯广志
大川铁平
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Nippon Steel Corp
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Nippon Steel Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

The invention provides a kind ofly possess substrate, the preparation method of angle brace welding point the face in the gusset given prominence to from the surface of this substrate and fillet welding portion.This preparation method is, in the direction of plate wide (w), otch processing carried out to one end of the plate width direction of the end of the length direction of described gusset and form notch, gusset described in the surface configuration of described substrate, with the long (d of the predetermined leg of described gusset side 2) carry out fillet welding for mode more than cut height (a), the long (d of leg of described gusset side 2') be the thickness of slab (t of described gusset 2) more than 1/3, and form the long (d of this leg 2'), the long (d of the leg of described substrate-side 1'), fusion penetration length (x ') and fusion penetration angle (θ ') meet x '+d 1' > d 2the described fillet welding portion of '/sin θ ', in described fillet welding portion at least the weld toe of the described substrate-side in boxing portion implement to improve the shock treatment of fatigue properties.

Description

Angle brace welding point and preparation method thereof outside face
Technical field
The present invention relates to utilize fillet welding to weld two boards parts face outside angle brace welding point and preparation method thereof.Particularly relate to angle brace welding point and preparation method thereof outside the excellent face of fatigue resistance.
Background technology
Maybe the plate member of this tectosome is installed on other parts (such as to strengthen the plate member of tectosome, other plate member), in the plate member of tectosome, with the mode fillet welding that the plate face from plate member is outstanding, other plate member is installed as appurtenances, the outer angle brace welding point of forming surface.
Known, when applying repeated stress to this welding point, such as, concentrate owing to producing significant stress in weld toe, or be formed with stretching residual stress in weld toe, so produce fatigue crack from this weld toe, fatigue-resistance characteristics significantly declines.
As its countermeasure, in the past, in order to suppress the stress of weld toe to be concentrated, the weld toe that such as have employed Welded Joints implements the method that milled processed, TIG finishing process, decoration built-up welding etc. increase the curvature in not-go-end portion.In addition, in order to reduce the stretching residual stress of weld toe, such as, have employed method weld toe being implemented to the shock treatment (shot peening strengthening) such as peening, hammer peening, laser shock peening, water jet shot-peening or welding after-baking.
In recent years, propose to have the shock treatment implementing to employ ultrasonic wave vibration (following, also UIT process (Ultrasonic Impact Treatment) is designated as), import compressive residual stress in weld toe, or improve the method for shape of weld toe.
Such as, following method is disclosed in patent document 1, namely, in order to make the fatigue resistance of material improve by importing compressive residual stress, with the material surface in the direction at a right angle, direction needing to improve fatigue resistance on form many processing belt that ultrasonic impact process produces, direction at least at a right angle with processing belt in this processing belt forms the edge at more than three places.In addition, following method is disclosed in patent document 2, namely, in order to improve the fatigue resistance of weld part, use ultrasonic impact treating apparatus near weld toe, to form radius of curvature R for more than 2mm in the mode that the impact density of the unit length of weld toe is 11 times/more than mm, wide is the groove of more than 1mm.In addition, in patent document 3, the hyperacoustic shock treatment device of use and impact processing method is disclosed.
Fig. 7 A ~ 7D is the schematic perspective view of the production order representing existing outer angle brace welding point, the situation near the boxing portion 110 of the outer angle brace welding point 101 of presentation surface.
Fillet welding has gusset 103 (Fig. 7 A ~ 7B) on substrate 102, and fillet welding portion 109 is formed weld toe 107,107 '.
And, as shown in Fig. 7 C ~ 7D, shock treatment is implemented to the weld toe 107 in boxing portion 110 in fillet welding portion 109, form shock treatment vestige 111.In addition, Fig. 7 A ~ 7D represents that the weld toe 107 to substrate 102 side implements the state of shock treatment.
Patent document 1:(Japan) JP 2006-167724 publication
Patent document 2:(Japan) JP 2006-175512 publication
The patent document 3:(U.S.) patent the 6th, 171, No. 415 publications
As mentioned above, shock treatment is implemented by the weld toe of angle brace welding point outside opposite, smooth (curve) shape making the shape of weld toe be formed as stress to be difficult to concentrate, and relax weld toe and neighbouring stretching residual stress thereof, apply compressive residual stress.Its result, can prevent the generation from weld toe and neighbouring crack thereof, improve fatigue resistance.Such method significantly suppresses the reduction of the fatigue life of causing owing to producing fatigue crack from weld toe, and fatigue resistance significantly improves, but outside the face utilizing fillet welding in angle brace welding point, on fatigue properties improve, there is boundary.
The present inventors are in order to improve the fatigue properties of angle brace welding point outside face further, and outside opposite, the weld toe in the boxing portion of angle brace welding point implements ultrasonic impact process, studies its fatigue life.Its result, distinguishes that most of fatigue crack produces from welding root, hinders the improvement of fatigue resistance.Namely, distinguish, by the shock treatment to weld toe, suppress the generation in the crack from weld toe, so the welding root certainly easily producing fatigue crack after weld toe produces fatigue crack and this fatigue crack extends expansion further, the fatigue life of the outer angle brace of influence surface.
For the generation of the fatigue crack of such welding root from fillet welding portion, if find to make the weld part of fillet welding be formed as complete molten dark weld part, then because not welding root, fatigue resistance is improved.But when carrying out complete molten deep welding and connecing, need to implement retaining wall on slope on a large scale, the time needed for welding operation is long, is difficult to limit angles fagging when the pre-welding of gusset.Therefore, the burden of welding operation is large, and cost increases.
Summary of the invention
The present invention makes in view of the foregoing, its object is to be provided in implement shock treatment in the outer angle brace welding point in the face of improving fatigue resistance to weld toe, further welding point and preparation method thereof of raising fatigue resistance.
The present inventors inquire into eliminating the effective ways concentrated at the stress of welding root.
Fig. 6 A and 6B is the generalized section that the stress in the boxing portion 10 that angle brace welding point 1 outside face when applying repeated stress is described is concentrated.The present inventors find, as shown in Figure 6A, move to than this position C more by the position B inside gusset 3 from the position C (the length direction end of substrate 2 side of gusset 3) in the past shown in Fig. 6 B by making the position of welding root 8, the leg controlling fillet welding is long, and fatigue resistance can be made thus to improve.That is, as shown in Figure 6A, long by the leg controlling fillet welding, relax the steepness in the dispersion path of stress, avoid concentrating at the stress of welding root 8, effectively increase throat depth.Therefore, it is possible to suppress the generation in the crack of welding root 8 and throat depth portion.Therefore, the shock treatment effect to weld toe can be given full play to, improve fatigue resistance further.The present inventors make the present invention based on above-mentioned discussion result.
Namely purport of the present invention is as described below.
(1) outside the face of one aspect of the present invention, the preparation method of angle brace welding point is for possessing substrate, give prominence to from the surface of this substrate and the gusset in the wide w direction that is plate, the direction vertical with the surface of described substrate, and the preparation method of angle brace welding point outside the face in fillet welding portion, wherein, otch processing is carried out to one end of the described substrate-side of the end of the plate length direction of described gusset and forms the cut height a of the plate width direction with described gusset, the notch of the cut angle θ of less than incision length x and 80 ° of the plate length direction of described gusset, described gusset is configured in the mode that the end face in the described plate wide w direction with the described gusset of described notch is relative with the surface of described substrate, with the long d of predetermined leg of described gusset side 2for the mode of described more than cut height a carries out fillet welding, the long d of leg of described gusset side 2' be the thickness of slab t of described gusset 2more than 1/3, and form the long d of this leg 2', the long d of leg of described substrate-side 1', fusion penetration length x ' and fusion penetration angle θ ' meets x '+d 1' > d 2the described fillet welding portion with boxing portion of '/sin θ ', implements shock treatment to the weld toe of the described substrate-side in boxing portion at least described in described fillet welding portion.
(2) outside the face described in above-mentioned (1) angle brace welding point preparation method in, described cut angle θ can be more than 45 ° and less than 75 °.
(3) angle brace welding point outside the present invention face on the other hand, possess substrate, give prominence to from the surface of this substrate and the gusset in the wide w direction that is plate, the direction vertical with the surface of described substrate and there is the fillet welding portion in boxing portion, wherein, in the described boxing portion in described fillet welding portion, the long d of leg of described gusset side 2' be the thickness of slab t of described gusset 2more than 1/3, and the long d of this leg 2', the long d of leg of described substrate-side 1', the fusion penetration length x ' of the plate length direction of described gusset and fusion penetration angle θ ' meets x '+d 1' > d 2'/sin θ ', and in described fillet welding portion, the weld toe of the described substrate-side at least described boxing portion is formed with shock treatment vestige.
(4) outside the face described in above-mentioned (3) in angle brace welding point, described fusion penetration angle θ ' can be more than 30 ° and less than 75 °.
But in the end in the cross section of the length direction of gusset, fusion penetration length x ' is that namely the intersection point of the vertical line of making from the weld toe 7 ' of gusset side to substrate puts the length of C ' to welding root 8.Fusion penetration angle θ ' is line segment 7 ' 8 and line segment 8C ' angulation.In addition, cut height a is the height from the surface of substrate to the incision site A of the notch of gusset.Incision length x is the length of the angle C to the position B of the end of the length direction of the substrate-side of the gusset formed after notch of the end of the length direction of substrate-side from the gusset formed before notch.Cut angle θ is line segment AB and the line segment BC angulation of notch.
Otch processing is carried out in the substrate-side bight of the length direction end face of diagonal angle fagging, gusset arranges notch, this gusset and substrate are carried out fillet welding and obtain welding point, in this welding point, the welding root in boxing portion, compared with the welding root when gusset not being arranged otch, reliably can significantly increase fusion penetration, throat depth at the length direction of gusset.In addition, the position adjustments leg corresponding to welding root due to this welding point is long, so situation of with the leg length of substrate-side for identical length carrying out fillet welding long with the leg of gusset side is compared, can increase throat depth further.
Like this, compared with existing welding point, can by the throat depth increase about more than 25% in boxing portion, so as shown in Figure 6A, relax stress concentrating to boxing portion, prevent from, from the fatigue rupture of welding root, the fatigue strength in the boxing portion of angle brace welding point outside face can being increased substantially.
Accompanying drawing explanation
Fig. 1 is that the A-A of Fig. 4 B of angle brace welding point outside the face after the welding schematically representing an embodiment of the present invention is to looking part sectioned view;
Fig. 2 is that the B-B of Fig. 4 D of angle brace welding point outside the face after the shock treatment schematically representing present embodiment is to looking part sectioned view;
The part sectioned view of the alternate manner of angle brace welding point outside the face that Fig. 3 represents present embodiment;
Fig. 4 A be represent present embodiment face outside the schematic perspective view of production order of angle brace welding point;
Fig. 4 B be represent present embodiment face outside the schematic perspective view of production order of angle brace welding point;
Fig. 4 C be represent present embodiment face outside the schematic perspective view of production order of angle brace welding point;
Fig. 4 D be represent present embodiment face outside the schematic perspective view of production order of angle brace welding point;
Fig. 5 be represent present embodiment face outside the schematic perspective view of alternate manner of gusset of angle brace welding point;
Fig. 6 A be illustrate when applying repeated stress in the present embodiment, stress is to the generalized section of the concentration status in the boxing portion of angle brace welding point outside face;
Fig. 6 B be illustrate when applying repeated stress, stress is to the generalized section of the concentration status in the boxing portion of angle brace welding point outside face;
Fig. 6 C be illustrate when applying repeated stress, stress is to the generalized section of the concentration status in the boxing portion of angle brace welding point outside face;
Fig. 7 A is the schematic perspective view of the production order representing existing outer angle brace welding point;
Fig. 7 B is the schematic perspective view of the production order representing existing outer angle brace welding point;
Fig. 7 C is the schematic perspective view of the production order representing existing outer angle brace welding point;
Fig. 7 D is the schematic perspective view of the production order representing existing outer angle brace welding point;
Fig. 8 is the generalized section of the position representing throat depth and throat depth.
Description of symbols
1: angle brace welding point (welding point) outside face
2: substrate (steel plate)
3: gusset (steel plate)
4: the notch (notch) of gusset
5: weld metal
6: molten thread (melt run)
7: weld toe (weld toe of substrate-side)
7 ': weld toe (weld toe of gusset side)
8: welding root
9: fillet welding portion
10: boxing portion
11: shock treatment vestige (ultrasonic impact vestige)
12: ultrasonic impact treating apparatus (shock treatment device)
13: apart from the position on the weld metal surface of welding root beeline
A: the position of the short transverse end of the notch of gusset
B: the position of the length direction end of the notch of gusset
C: the length direction end (angle) forming the gusset before notch
C ': the vertical line of making from the weld toe of gusset side to substrate and the intersection point of substrate surface
C ": the vertical line of making from gusset incision site A to substrate and the intersection point of substrate surface
S: gusset cut sides
A: notch height (mm)
X: notch length (mm) (from the substrate-side end C of the gusset formed before notch to the length of substrate-side end B being formed with the gusset after otch)
X ': fusion penetration length (mm) (intersection point of the vertical line of making from the weld toe of gusset side to substrate and substrate surface is to the length of welding root)
θ: cut angle (°) (angle between substrate surface and cut sides S)
θ ': fusion penetration angle (°) (connecting line of the weld toe of joint angle fagging side and welding root and the connecting line angulation of intersection point on surface being connected vertical line and the substrate of making from the weld toe of gusset side to substrate)
D 1: the predetermined leg long (mm) of substrate-side
D 2: the predetermined leg long (mm) of gusset side
D 1': the leg long (mm) of substrate-side
D 2': the leg long (mm) of gusset side
F: the degree of depth (mm) of shock treatment vestige
R: the radius of curvature (mm) of shock treatment vestige
T: throat depth
Detailed description of the invention
Below, the present invention is specifically described.
Fig. 1 be represent Fig. 4 B face outside the longitudinal sectional drawing of plate length direction of gusset 3 of angle brace welding point 1, namely the A-A of Fig. 4 B is to the schematic diagram looking section, represents and implements the state before shock treatment to weld toe 7.Fig. 2 represents that the B-B of Fig. 4 D is to the schematic diagram looking section, represents and implements shock treatment to weld toe 7 and be formed with the state of shock treatment vestige.
In one embodiment of the present invention, in order to improve the fatigue resistance of welding point, notch being set in the bight of gusset to guarantee large throat depth, reducing to concentrate in the repeated stress of welding root.That is, from Fig. 6 A and 6B, throat depth increases.In addition, in JIS Z 3001, throat depth is defined as the distance of root (welding root 8) to surface in the cross section from angle welding, is the distance t in Fig. 8.Therefore, according to weld metal surface and mother metal the crossing position of weld toe 7,7 ', surface and the fusion penetration shape of weld metal, from the beeline on welding root 8 to weld metal surface sometimes for welding the distance of root 8 and weld toe 7 or welding the distance of root 8 and weld toe 7 '.That is, the point 13 (end points of throat depth) on weld metal 5 surface that the distance on the surface of welding root 8 to weld metal 5 is minimum is sometimes consistent with weld toe 7 or weld toe 7 '.
The each point of following above-mentioned definition weld metal 5 and each size in Fig. 1 and Fig. 2.The position of the weld toe 7 of substrate 2 side is defined as a little 7, the position of the weld toe 7 ' of gusset 3 side is defined as a little 7 ', the position of welding root 8 is defined as a little 8, the intersection point of the vertical line of making to the surface (line segment 78) of the substrate 2 before welding from the weld toe 7 ' of gusset 3 side is defined as a C '.In addition, the distance definition of the welding root 8 after welding with some C ' is fusion penetration length x ' (mm), line segment 7 ' 8 and line segment 8C ' angulation are defined as fusion penetration angle θ ' (°), the length of line segment 7C ' are defined as the long d of leg of substrate 2 side 1' (mm), the length of line segment 7 ' C ' is defined as the long d of leg of gusset 3 side 2' (mm).In addition, the distance of a C ' to the not-go-end (weld toe 7,7 ') of angle welding is defined as by long for leg.As described later, the gusset 3 being provided with notch 4 is carried out fillet welding with substrate 2 by the condition such as welding condition, leg length that changes, and is made into the welding point 1 shown in Fig. 1.After ultrasonic impact process is implemented to the weld toe 7 ' in the boxing portion 10 of this welding point 1, investigated the fatigue resistance of the welding point 1 shown in Fig. 2 by fatigue test.In addition, the long d of leg of substrate 2 side is investigated 1the long d of leg of ' (mm), gusset 3 side 2' (mm), fusion penetration angle θ ' (°), fusion penetration length x ' (mm) are separately and the relation of fatigue resistance.In addition, boxing portion 10 is made up of the weld part of end face of the weld part formed by boxing and the plate length direction that is formed at gusset.
Its result, is judged as, carry out welding the welding point 1 that obtains with arrange the welding point of notch on gusset compared with by arranging notch 4 on gusset 3, can increase throat depth, fatigue resistance is excellent.But, at the long d of leg 1' little when, the end points (point 13 of Fig. 8) of throat depth portion (part that weld metal 5 is the thinnest) can from gusset 3 side near the weld toe 7 of substrate 2 side the most easily producing fatigue crack.Therefore, judge from the viewpoint of the fatigue resistance of the weld toe 7 of raising substrate 2 side, reduce the long d of leg 1' be undesirable.
Therefore, in the present embodiment with fusion penetration length x ' and the long d of leg 1' the mode that meets following formula (1) specifies the position of weld toe 7 and the fusion penetration amount of minimum of substrate 2 side after welding.Thus, the end points 13 in throat depth portion can be avoided to become the weld toe 7 of substrate 2 side, excellent fatigue resistance can be guaranteed.
x′+d 1′＞d 2′/sinθ′...(1)
in addition, fusion penetration length x ' and the long d of leg 1' also can meet following formula (1 ').
x′+d 1′＜10d 2′/sinθ′...(1′)
In addition, darker to the fusion penetration (molten thread 6 is to the movement in gusset 3) in gusset 3, fusion penetration angle θ ' is less, so be applicable guaranteeing in throat depth this point.But, spended time and labour during owing to such as must carry out retaining wall on slope in advance, or need multilayer weld layer in order to ensure fusion penetration, or before welding fixed part time spended time and labour, so the welding operation time is elongated.Therefore, preferred fusion penetration angle θ ' is 35 ° ~ 60 °.In addition, when fusion penetration angle θ ' is greater than 75 °, fusion penetration length x ' is short, so in order to guarantee large throat depth fully, needs to increase the long d of leg 2', need to carry out the welding operations such as multiple-bead deposit, expend time in and labour.
The present inventors are in order to improve the fatigue resistance of angle brace welding point outside face further, and the impact long on the leg of the welding point possessing the gusset defining notch is investigated.That is, use the gusset being provided with notch, make the long d of welding leg of gusset side 2' at the thickness of slab t of gusset 21/3 times to thickness of slab t 25/7 times between change and carry out fillet welding, make welding point.In addition, the mode of (1) makes fusion penetration angle θ ' change between 30 ° ~ 75 ° to satisfy equation, makes the long d of the leg of substrate-side 1' roughly certain.After implementing the ultrasonic impact process for improving fatigue resistance to the weld toe in the boxing portion of the welding point made like this, by the fatigue resistance of fatigue test investigation welding point.
Its result, the leg being provided with the welding point gusset side of the gusset of notch if employ is long little, then as shown in Figure 6 C, large stress is acted in throat depth portion, from the neighbouring generation fatigue crack of the weld toe 7 ' of gusset 3 side, or produce fatigue crack and through weld metal 5 from welding root 8.Therefore, by raising fatigue resistance aspect, be undesirable by long for the leg of gusset side shortening.Therefore, the result that the leg progress row of fagging side, further diagonal angle is inquired into is distinguished, in order to make stress reduction act in the throat depth portion of weld metal, by by long for the leg of gusset side d 2' be formed as the thickness of slab t of gusset 2more than 1/3, increase substantially fatigue resistance.
Therefore, in present embodiment, the long d of leg of gusset side 2' be the thickness of slab t of gusset 2more than 1/3.Outside the face of present embodiment in angle brace welding point, long by the leg of the thickness of slab determination gusset side according to gusset, the stress that can relax in throat depth portion is concentrated.Therefore, effectively play shock treatment to weld toe 7 to the improvement effect of fatigue resistance, the fatigue resistance of welding point can be increased substantially.In addition, the size of gusset is considered, the long d of leg 2' be wide below the w of plate of gusset.
Outside the face of present embodiment in angle brace welding point, specify the long d of leg of gusset side as described above 2' and the thickness of slab t of gusset 2relation, and specified the long d of leg of fusion penetration length x ', fusion penetration angle θ ', substrate-side by formula (1) 1', the long d of leg of gusset side 2' between relation.By this relation, fully guarantee the throat depth of weld part, the stress relaxed in throat depth portion is concentrated.In addition, the ultrasonic impact process for improving fatigue properties being implemented to the weld toe in boxing portion, improving fatigue resistance.In addition, in order to fall stress concentration, increase the long d of leg of substrate-side 1', or the shape of processing weld toe 7 in advance is glossily effective.
Below, the effective preparation method of angle brace welding point outside the face of an embodiment of the present invention is described.
Fig. 4 A ~ 4D be present embodiment is schematically described face outside the partial perspective view of order of preparation method of angle brace welding point.Outside face, angle brace welding point 1 possesses substrate 2 (thickness of slab t 1) and gusset 3 (the thickness of slab t of fillet welding on the surface of substrate 2 (mm) 2(mm)).In addition, vertical with the surface of substrate 2 direction (the thickness of slab t of substrate 2 1direction) consistent with the direction (short transverse) of the wide w of the plate of gusset 3.In addition, with direction and the thickness of slab t of the wide w of the plate of gusset 3 2orthogonal direction, direction be the plate length direction (hereinafter referred to as length direction) of gusset 3.Comprising and thickness of slab t of the end face of this length direction 2the part on the limit (angle) of equidirectional is the bight of gusset 3.
Outside the face of present embodiment in angle brace welding point, rectangular angular fagging 3 is formed by the bight of this substrate 2 side (bight) height (the wide w) direction of plate carry out otch processing after notch 4 (Fig. 4 A).This notch 4 has the size of a (mm) in the upper bight apart from the gusset 3 relative with substrate 2 of the short transverse (the plate wide w direction of gusset 3) of gusset 3, and at the length direction (direction towards the center of the length direction of gusset 3) of gusset 3 apart from the bight of the gusset 3 relative with substrate 2 to having x (mm) size.
Gusset configures on a substrate 2 in the mode that the end face in the plate wide w direction with the gusset 3 of notch 4 is relative with the surface of substrate 2.Afterwards, there is gusset 3 and substrate 2 fillet welding of notch 4.Its result, around the face that gusset 3 is relative with substrate 2, (near 4 limits) are formed with fillet welding portion 9, in this fillet welding portion 9, around the end (right-hand end of the gusset 3 shown in Fig. 4 B) of the length direction of gusset 3, be formed with boxing portion 10 (Fig. 4 B).In the fillet welding portion 9 formed so at least boxing portion 10 weld toe 7,7 ' near implement by such as ultrasonic impact treating apparatus 12 shock treatment (Fig. 4 C) improving fatigue resistance.Its result, is formed with shock treatment vestige 11 (Fig. 4 D) in weld toe 7,7 '.
As shown in Fig. 4 A ~ 4D, outside face, angle brace welding point usually mostly has the length of the short transverse of gusset (plate is wide w) is length (the thickness of slab t in thickness of slab direction 2) more than shape (t 2≤ w).That is, gusset is configured in the mode that the end face in thickness of slab direction is relative with the plate face of substrate, angle brace welding point outside face periphery (four limits) fillet welding of this end face being formed shape shown in Fig. 4 A ~ 4D in substrate angle.Therefore, be described for angle brace welding point outside the face of shape shown in Fig. 4 A ~ 4D.
In addition, in the present embodiment, the shape of gusset is not limited to the shape (t shown in Fig. 4 A ~ 4D 2≤ w).Such as, the shape of gusset also can be the shape (t shown in Fig. 5 2> w).That is, also can be that (plate is wide w) than length (the thickness of slab t in thickness of slab direction for the length of short transverse of gusset 2) little shape.
In addition, boxing portion is formed at the bight end face of the thickness of slab direction (4 jiaos) of the gusset with notch.At this, for convenience of explanation, be described for the boxing portion being formed at the end in gusset panel length direction.
The longitudinal sectional drawing of the length direction of the gusset 3 of angle brace welding point 1 outside the face that Fig. 1 represents Fig. 4 B.That is, Fig. 1 represents that the A-A of Fig. 4 B is to the schematic diagram looking section, represents the state before implementing shock treatment to weld toe 7.Fig. 2 represents that the B-B of Fig. 4 D is to the schematic diagram looking section, represents and is formed with state weld toe 7 being implemented to the shock treatment vestige 11 after the shock treatment improving fatigue resistance.
As shown in Fig. 1 and Fig. 4 B, in the bight of the end (being formed with the end in boxing portion 10) of diagonal angle fagging 3 length direction, substrate 2 side corner sections carries out otch processing, and shape is at notch 4.This notch 4 in order to increase engaged by weld metal 5 area, fully guarantee throat depth and formed.
Define each point of the notch 4 before fillet welding and each size in FIG.The angle of substrate 2 side of the end of the length direction of the quadrangle gusset 3 before otch is defined as angle C.In addition, the short transverse along base portion 2 is defined as position A from the position of the end face of gusset 3 length direction of the surface distance cut height a (mm) of the substrate 2 of gusset 3 side.That is, the position A of Fig. 1 be along gusset 3 width w direction (short transverse of substrate 2) from angle C distance cut height a (mm) position.In addition, the position of inner side (from the end of gusset 3 towards the direction at the center of the length direction of gusset 3) distance length x (mm) from the angle C of gusset 3 to gusset 3 is defined as position B.And the intersection point of the vertical line of being made on the surface (line segment 78) of substrate 2 before from position A to welding is defined as a C ".By this C " and the distance definition between the B of position is the incision length x of outward appearance ".In FIG, notch 4 is formed by the leg-of-mutton scope that position A, position B and angle C surround at thickness of slab direction upper cut.In addition, in FIG, incision length x is " consistent with the length x of outward appearance.
At this, in Fig. 1 and Fig. 2, angle C is consistent with some C '.That is, the intersection point of the vertical line that the surface (line segment 78) of substrate 2 before from incision site A to welding is made and the intersection point of vertical line of making to the surface (line segment 78) of the substrate 2 before welding from the not-go-end portion 7 ' of gusset 3 side are represented by the same position overlapped.Now, the end face of gusset 3 length direction is orthogonal with the upper surface of substrate 2.
In addition, there is the situation that the two is in non-orthogonal relation.Such as, in the part sectioned view of the welding point schematically represented at Fig. 3, the shape of the gusset 3 before otch is different from the shape shown in Fig. 1.Like this, when the trapezoidal gusset shown in Fig. 3, angle C is different with the position of some C '.In addition, the incision length x in incision length x and the Fig. 1 in Fig. 3 compares, only angle C and some C " between distance increase.Below, be described for the situation of angle brace welding point 1 outside the face of Fig. 1.In addition, when the fillet welding in arc notch portion, incision length x shortens angle C and some C " between distance.
Need the long d of predetermined leg of gusset 3 side this cut height a (position A is to the length of angle C) being set as welding point 1 2below.Cut height a is greater than the long d of predetermined leg 2time, remain the notch that not soldered metal 5 covers in the boxing portion of gusset 3 side, complete weld part may be can not get.In addition, as long as notch 4 is formed on gusset 3, so without particular limitation of the lower limit of cut height a.But, when cut height a is too small, reduced by the area of solder joints, so suppress the reduction that tells on of fatigue crack.When usually carrying out the welding of gusset 3 with the layer of less than three layers, preferred cut height a is the long d of predetermined leg of gusset 3 side 280 ~ 90%.
That is, preferred cut height a and the long d of predetermined leg 2relation must meet following formula (2), meet following formula (3) as well.
0＜a≤d 2...(2)
0.8d 2≤a≤0.9d 2...(3)
In addition, the long d of leg of cut height a and gusset 3 side 2' relation meet following formula (4).
d 2′＞a ...(4)
In addition, the long d of predetermined leg 1, d 2for the leg of target during fillet welding is long.
On the other hand, as shown in Figure 1, line segment AB and line segment BC angulation are defined as cut angle θ.This cut angle θ is the angle (the line segment angulation of the line segment forming cut sides and the upper surface forming the substrate before welding) that the surface of the cut sides S of the notch 4 of gusset 3 and the substrate 2 before welding is formed.Relation between cut angle θ and incision length x and cut height a owing to meeting following formula (5), so by following formula (6) derive following formula (7).
a/x＝tanθ...(5)
a≤d 2...(6)
xtanθ≤d 2...(7)
Therefore, the mode needing to meet above-mentioned formula (7) sets the size (incision length x and cut angle θ) of notch 4.But, when considering the situation of Fig. 3, the incision length x of outward appearance " and cut angle θ must meet following formula (8).
x″tanθ≤d 2...(8)
Incision length x (mm) (or the incision length x ") of outward appearance is if meet above-mentioned relation, then not special provision.But when incision length x is long, cut angle θ is too small.Therefore, narrow especially near the B of position by the gap of the part of line segment AB and line segment BC encirclement, be often difficult to during welding send into the welding material such as welding wire and welding rod.In this situation, weld metal not in-position B fully, likely easily produces the failure weldings such as the insufficient fill of weld metal and insufficient (incomplete) penetration.
In addition, when cut angle θ increases, incision length x shortens, and the surface area of notch reduces.Therefore, increased by the area of solder joints, the effect of the notch 4 that the stress reducing to make to produce at root reduces.
Therefore, in order to make to be increased by the area of solder joints, as long as the scope meeting above-mentioned formula (1) at x, not producing failure welding and significantly can guarantee that the mode of otch area selectes cut angle θ and incision length x.
In addition, the stress in order to reduce weld toe 7 concentrates the long d of preferred leg 1' large as far as possible.In addition, in order to easily carry out ultrasonic impact process thereafter, preferably weld weld toe 7 and 7 ' as far as possible glossily.
The present inventors prepare the various gussets being formed with notch in the mode that at least one condition in cut height a, cut angle θ, incision length x is different, by certain long d of predetermined leg 2fillet welding make welding point.After the weld toe in the boxing portion of this welding point carries out ultrasonic impact process, fatigue test is utilized to investigate fatigue properties.Consequently, cut angle θ is less than 80 °, reliably can improve the fatigue properties of welding point.Therefore, the cut angle θ of notch is less than 80 °.In addition, there is no particular limitation for the lower limit of cut angle θ.Because cut angle θ is more than 45 °, the gap (gap of notch) between substrate and gusset is enough, so welding wire can reliably arrive welding root.In this situation, can effectively stably obtain enough fusion penetrations with the short period.In addition, cut angle θ is less than 75 °, can guarantee incision length x and throat depth fully.In this situation, the fatigue resistance of welding point improves fully.Therefore, preferred cut angle θ is more than 45 ° and less than 75 °.More preferably this cut angle θ is more than 50 ° and less than 70 °.
As mentioned above, carrying out fillet welding by arranging notch in the end in the gusset panel length direction of having carried out boxing, compared with not forming the situation of otch, the welding root of fillet welding can be made to leave from weld toe, throat depth can be made to increase.Its result, can relax the situation that the effect applying the power that repeated stress produces concentrates on welding root, can improve the fatigue resistance (with reference to Fig. 6 A) of welding point.As mentioned above, in order to not produce this failure welding of insufficient (incomplete) penetration in fillet welding portion, usually weld while guaranteeing sufficient fusion penetration.Also guarantee enough fusion penetrations in the present embodiment and weld, not produce this failure welding of insufficient (incomplete) penetration comprising the welding root part of putting B (Fig. 1, Fig. 2 reference) of ascending the throne.
As mentioned above, with the leg long d of fusion penetration length x ' with substrate-side 1' the mode that meets above-mentioned formula (1) considers the long d of leg 1', d 2' and fusion penetration angle θ ' and welding.Its result, the weld toe of substrate-side after welding can guarantee the fusion penetration amount of minimum.Therefore, part that throat depth is the thinnest can be avoided to be the not-go-end portion of substrate-side, excellent fatigue resistance can be guaranteed.
In addition, the long d of leg 1', d 2' respectively relative to the long d of predetermined leg 1, d 2meet following formula (9) and formula (10).
d 1′≥d 1...(9)
d 2′≥d 2...(10)
As mentioned above, by arranging notch, can effectively make the welding point meeting above-mentioned formula (1).
The present inventors are described above, in order to improve the fatigue resistance of angle brace welding point outside face further, use the gusset defining notch, to the long d of the leg in fillet welding portion 1', d 2' impact investigate.It found that, the long d of leg of gusset side 2' in short-term, relative to the thickness of slab t of gusset 2, throat depth reduces, so the stress in throat depth portion increases.In addition, find by making the long d of the leg of gusset side 2' be formed as the thickness of slab t of gusset 2more than 1/3, the fatigue resistance of welding point increases substantially.
Therefore, in the preparation method of the welding point of present embodiment, with the long d of the leg of gusset side 2' be the thickness of slab t of gusset 2the mode of more than 1/3 (following formula (11)) weld.By the long d of leg of pilot angle fagging side 2' and the thickness of slab t of gusset 2relation, enough throat depths can be guaranteed further, so make the generation stress of welding root reduce, the fatigue resistance of welding point can be increased substantially.
d 2′≥t 2/3...(11)
In addition, in common welding, the long d of leg of substrate-side 1' and the long d of leg of gusset side 2' be mostly roughly the same length.But, the long d of leg of substrate-side 1the formula (1) that ' demand fulfillment is above-mentioned, the long d of leg of gusset side 2the above-mentioned formula of ' demand fulfillment (1) and above-mentioned formula (11).
As mentioned above, outside the face of present embodiment angle brace welding point preparation method in, the notch of regulation is set at gusset, with the long d of the leg of gusset side 2' be the thickness of slab t of gusset 2more than 1/3 mode and the mode meeting formula (1) obtain enough fusion penetrations and carry out fillet welding.
In addition, be preferably more than 45 ° with the cut angle θ of gusset and the mode of less than 75 ° forms notch.In addition, weld preferably by the mode obtaining enough fusion penetrations, obtain fusion penetration angle θ ' and be more than 30 ° and the fillet welding portion of less than 75 °.
Like this, by arranging notch on gusset, fully guaranteeing fusion penetration and welding, the area of section of each parts engaged by weld metal can be increased thus, enough throat depths can be guaranteed.Therefore, the stress produced at welding root can be made to reduce, effectively increase substantially the fatigue resistance of welding point.
Below, in the welding point of present embodiment, in the fillet welding portion as above formed at least the weld toe in boxing portion implement to improve the shock treatment of the fatigue resistance of weld toe self.
This shock treatment at least needs the weld toe easily producing the substrate-side in the boxing portion of fatigue crack when applying repeated stress.But also can implement shock treatment in whole weld toe in boxing portion or fillet welding portion.
The shock treatment improving fatigue resistance also can be the shot peening such as peening, hammering.The method of this shock treatment is not particularly limited.That is, impact weld toe until the degree of not-go-end line position of weld toe before can not judging shock treatment, form smooth recess in weld toe, can compressive residual stress be provided by Plastic Flow.
But, because of ultrasonic impact treating apparatus produce shock treatment (UIT process) be effective, so preferably it.The condition of this UIT shock treatment that weld toe is carried out is not particularly limited.In this situation, the fatigue resistance preferably needed for material (parts) carries out suitable UIT shock treatment.
Below, example is carried out to the situation (UIT process) utilizing ultrasonic impact device to implement shock treatment.The radius of curvature r that shock treatment is preferably formed in the cross section vertical with the sealing wire of weld toe is more than 1.0mm and below 10.0mm, is more than 0.05mm and the ultrasonic impact vestige 11 of below 1.0mm from steel (substrate or gusset) surface to the degree of depth f of the thickness direction of steel.More preferably its degree of depth f is more than 0.1mm and below 0.4mm.
When the radius of curvature r of shock treatment vestige (ultrasonic impact vestige) 11 is more than 1.0mm, the stress that can fully relax in fillet welding portion is concentrated.In addition, when this radius of curvature r is below 10.0mm, while radius of curvature r increases, relax the effect increase that stress is concentrated.In this situation, the fatigue-resistance characteristics of welding point can be improved further.This radius of curvature r can consider the processing time and suitably determine.In addition, shock treatment vestige (ultrasonic impact vestige) 11 is formed usually centered by weld toe 7,7 '.But preferably shock treatment vestige (ultrasonic impact vestige) 11 is to comprise weld metal 5 and welding heat affected mode is at least partially formed.Therefore, the position forming shock treatment vestige 11 is preferably considered, the radius of curvature r of selected ultrasonic impact position and ultrasonic impact vestige.
In addition, if be below 1.0mm to the degree of depth f of the shock treatment vestige (ultrasonic impact vestige) 11 of substrate 2 or gusset 3, while then this degree of depth f increases, the effect of the stretching residual stress near release weld toe 7 or the effect of applying compressive residual stress increase.Therefore, increasing substantially of the fatigue-resistance characteristics of welding point can be expected.In addition, if degree of depth f increases, then because of needs time enough, so consider that efficiency decides degree of depth f.Therefore, the degree of depth f of preferred ultrasonic impact vestige 11 is below 1.0mm.In addition, the degree of depth f of ultrasonic impact vestige 11 is not particularly limited.As the amount of position of not-go-end line that can not differentiate the weld toe before shock treatment, such as, the degree of depth f of ultrasonic impact trace 11 also can be more than 0.05mm.
In addition, the ultrasonic impact device 12 for implementing ultrasonic impact process such as can use device disclosed in above-mentioned patent document 1 ~ 3.Can consider that the conditions such as the shape of the ultrasonic impact vestige 11 formed carry out the shape of the vibration terminal (pin) of selected ultrasonic impact device 12.
Such as, preferably the radius of curvature of the axial cross section of ultrasonic impact device 12 front end is set as more than 1.0mm and below 10mm.The shape of this front end is the shape of the ultrasonic impact vestige 11 after shock treatment.Therefore, when this radius of curvature is too small, the groove of incision-like is formed at weld toe, and stress is concentrated and improved.On the other hand, when radius of curvature is too large, according to the shape of welding bead, even if impact weld toe by shock treatment, be also difficult to the ultrasonic impact vestige 11 of the radius of curvature r forming regulation.Therefore, in order to reliably form the ultrasonic impact vestige of the radius of curvature r of regulation, the radius of curvature of the axial cross section of preferred ultrasonic impact device 12 front end is more than 1.0mm and below 10mm.In addition, preferably this radius of curvature is more than 1.5mm and below 5.0mm.
For the condition of ultrasonic impact process, as long as the fatigue resistance needed for purposes is suitably selected.Therefore, the condition of ultrasonic impact process is not particularly limited.Such as, preferably make vibration terminal with more than 20kHz and the frequency vibration of below 50kHz, with more than 0.01kW and the power of below 4kW implement ultrasonic impact.But there is no need necessarily to be impacted, so also can impact with below 20kHz low frequency or discontinuous cycle by ultrasonic wave vibration.Thus, the metal plastic flowing on the surface of weld toe, the stretching residual stress cooling along with fillet welding portion formed discharges, and can form the residual stress field of compression.In addition, by repeatedly not carrying out ultrasonic impact process from the state of thermal isolation of the surface radiating of weld toe with the heat produced because of processing, the effect identical with forge hot can be applied to weld toe.Consequently, the crystalline structure miniaturization near weld toe, improves the fatigue resistance of welding point.
Embodiment
Substrate is employed to the steel plate (thickness of slab 14mm × wide 50mm × long 500mm) of the steel grade JIS SM490B that JIS G3106 records.In addition, gusset is employed and the steel plate (thickness of slab 14mm × wide 50mm × long 100mm) of substrate with steel grade.This gusset is configured on substrate as shown in Figure 4 A.That is, make the length direction of gusset consistent with the length direction of substrate 2, width and the direction vertical with the upper surface of substrate of gusset are consistent.In addition, gusset is configured with at the length direction of substrate and the cardinal principle central portion (central part of upper surface) of width.
The gusset fillet welding configured as mentioned above is made the sample of angle brace welding point outside face in substrate.In addition, gusset same for the gusset of the upper surface with substrate is also arranged at the lower surface (not shown) of substrate.The position of the gusset of this lower surface is the position the same with the position of the gusset of upper surface.Make the sample of angle brace welding point outside 20 faces, on gusset, notch is arranged to 16 in these 20 samples.In addition, use and the same steel grade of substrate for 2 in these 16 samples, the steel plate (thickness of slab 20mm × wide 50mm × long 100mm) of the angle brace thickness of slab of other 14 samples of thickness ratio is as gusset.In addition, 4 samples that gusset is not formed notch as shown in Figure 7 B, are angle brace weld joint samples outside the face of conventional example.
For 16 samples in above-mentioned sample, partial cut-out processing is carried out in the bight of the substrate-side at the two ends of diagonal angle fagging length direction, forms notch 4.Now, to satisfy equation the mode of (2) determines cut height a and the long d of predetermined leg 2, and make cut angle θ (surface of substrate and the cut sides angulation of gusset) 25 ~ 80 ° of changes, change incision length x.
In addition, the long d of predetermined leg of gusset side 2and the long d of predetermined leg of substrate-side 1set respectively based on welding design basis etc.
Said sample all by employ as welding wire YGW-11 (JIS Z3321: string diameter 1.4mm) carbon dioxide semi-automatic welding (GMAW: voltage 35V, electric current 350A, speed 3mm/sec, gas composition CO 2100%) weld.
In addition, the long d of the leg of gusset side 2' be the thickness of slab t of gusset 2more than 1/4 and less than 3/4.In addition, the long d of the leg of substrate-side 1' except 1 sample, be d long with the leg of gusset side 2the length that ' cardinal principle is identical.The long d of these legs 1', d 2' except 1 sample, be respectively the long d of predetermined leg of substrate-side 1, gusset side the long d of predetermined leg 2above.
Utilize ultrasonic impact treating apparatus to implement UIT process to the weld toe of the substrate-side in the boxing portion of the sample of angle brace welding point outside the face made like this, be formed with shock treatment vestige.The radius of curvature of the axial cross section of vibration terminal (pin) front end of this ultrasonic impact treating apparatus is 1.0 ~ 10.0mm.In addition, the condition of UIT process is the vibration frequency of 27kHz, the power of 1kW.In addition, near the weld toe of the substrate-side in boxing portion, the shock treatment vestige that radius of curvature r is 1.0 ~ 10.0mm, case depth f is below 1.0mm is formed with.In addition, in order to compare, in above-mentioned 20 samples 2 do not implement UIT process.
Fatigue test is carried out for whole samples of angle brace welding point outside the final face made.In this fatigue test, under being determined at the condition of the stress amplitude of 100MPa and the stress ratio of 0.1 until fracture before number of repetition.
In addition, after fatigue test, along its length the general center of the thickness of slab of gusset is cut off, make cross-section sample.Near the boxing portion of corroding the both ends of the length direction of this sample (test body) with nitric acid ethanol, measure fusion penetration length (the intrusion length of weld metal) x ', the long d of leg 1', d 2', throat depth t.In addition, the shape in the shock treatment portion of weld toe is observed.
Table 1 represents its result.
In addition, the long d of the leg of table 1 1', d 2' and throat depth t be the mean value of each position (4 place) being formed with boxing portion.That is, for the long d of leg 1', d 2' and throat depth t, consider the boxing portion at both ends in gusset panel length direction and the boxing portion on the two sides of substrate.The value that fatigue resistance (until number of repetition of fracture) is each sample.
[table 1]
For implementing No.2 ~ 5 of UIT process, the sample of 7 ~ 20, all be formed with in weld toe that radius of curvature r is 1.0 ~ 10.0mm, from steel surface to the shock treatment vestige that the degree of depth f of the thickness direction of substrate is below 1.0mm, the shape of weld toe is curve.
As shown in table 1, when gusset does not arrange notch, do not implement the conventional example of UIT process and the sample of No.1 compared with the test film of the conventional example and No.2 that implement UIT process, fatigue resistance is poor.The fatigue resistance improvement confirmed under UIT process is compared according to this.In addition, in the sample of No.6, gusset arranges enough notch, each size (such as, long d of leg of welding point 1', d 2') meet formula (1), but do not implement UIT process.Therefore, until the number of repetition before fracture is about 300,000 times.This number of repetition is the sample same levels with the No.1 not implementing UIT.Like this, even form notch, the long d of leg is guaranteed 1', d 2' situation, do not given play to the improvement effect of fatigue resistance expanded based on throat depth yet.
In the sample of No.8 and No.11, gusset does not arrange notch, each size of welding point does not meet formula (1).In addition, the long d of the leg of gusset side 2' also not long enough.Therefore, no matter whether implement UIT process, all can not improve the fatigue resistance of welding point.
In addition, in No.9,10 and 12 samples, gusset is provided with notch, but the long d of the leg of gusset side 2' do not meet above-mentioned formula (11).Therefore, the fatigue resistance of welding point can not be improved.
In the sample of No.11 and 12, because relative to the thickness of slab t of gusset 2, the long d of leg 2' short, so the thickness of slab t with gusset can not be obtained 2corresponding throat depth.Therefore, the stress in throat depth portion increases, and weld metal ruptures, and the life-span of No.11 and 12 samples is not oversize.
Relative to said sample, gusset is formed the notch with sufficient size, to meet the size in fillet welding portion (such as, above-mentioned formula (1)) the mode of condition carry out fillet welding, judge in the No.3 implementing UIT process and 4 samples, as shown in table 1, the fatigue resistance of welding point significantly improves.
In the sample of No.13, cut angle θ is less than the sample of No.3, and initial incision angle θ is less than 45 °.Therefore, in order to fully guarantee the fusion penetration to welding root, weld interval increases.It found that, fully can guarantee final fusion penetration amount, meets fusion penetration length x ' for formula (1), improves the effect of fatigue resistance.In addition, when cut angle θ is little, in order to ensure the fusion penetration to welding root, require high welding technical ability and time.Therefore, industrially preferably in suitable scope, cut angle θ is set.
There is notch and the fillet welding portion of sufficient size in the sample of No.5.Therefore, with do not form the No.2 sample of notch at gusset compared with, the fatigue resistance of welding point is improved.
Different from No.13 sample at the sample of No.14, cut angle θ is more than 75 °.In this sample, final utilization welding makes notch through welding fully.In this situation, fusion penetration angle θ ' is 75 °, and the size in fillet welding portion meets above-mentioned formula (1).It found that, the effect of the fatigue life of welding point.In addition, the fusion penetration angle θ ' of No.14 sample is less than No.5 sample, so the fatigue resistance of No.14 sample is higher than No.5 sample.
In the sample of No.15, fusion penetration angle θ ' is less than 45 °, finds fatigue life.Same with No.13 sample, fusion penetration angle θ ' is the smaller the better, but when considering the fusion penetration amount of actual welding as mentioned above, is preferably more than 30 °.
The sample of No.16 and 17 is the long d of leg of substrate-side 1' less example.In No.16 sample, the size because of fillet welding portion does not meet formula (1), increases, can not obtain the effect of fatigue life so the stress of weld toe is concentrated.On the other hand, in No.17 sample, the size in fillet welding portion meets formula (1), has the effect of the fatigue resistance improving welding point.
In addition, the sample of No.18 is the example that fusion penetration length x ' is less.Because the size in fillet welding portion does not meet formula (1) in this sample, increase so the stress of weld toe is concentrated, the effect of fatigue life can not be obtained.
The sample of No.19 is cut height a d longer than predetermined leg 2and the long d of leg 2' large example.In this sample, at the residual not soldered plated notch in the boxing portion of gusset side, the weld toe 7 ' from gusset side produces crack, can not obtain sufficient fatigue resistance.In addition, in No.19 sample, because fusion penetration angle θ ' (the symbol * in table 1) can not be defined, so use location A replaces weld toe 7 ' to evaluate fusion penetration angle θ '.
The sample of No.20 is the example that cut angle θ is less than No.3 and No.13 sample.In this sample, can not guarantee until enough fusion penetrations of otch front end.But fusion penetration length x ' meets formula (1), there is the effect improving fatigue resistance.In addition, in No.3 and No.13 sample, welding operation burden is less than No.20 sample, easily can guarantee the fusion penetration to welding root.Therefore, industrially preferably in suitable scope, cut angle θ is set.
Can confirming according to these results, by making the welding point meeting above-mentioned condition, the fatigue resistance of welding point can be increased substantially.
The Patent 2009-193201 CLAIM OF PRIORITY that the application filed an application in Japan based on August 24th, 2009, quotes its content at this.
Utilizability in industry
According to the present invention, outside face, in angle brace welding point, effectively can increase the fusion penetration of welding root, increase throat depth, so the stress that can relax welding root is concentrated.Therefore, the effect utilizing peening and UIT process such shock treatment that the fatigue resistance of weld toe is improved can be produced fully, the fatigue resistance of angle brace welding point entirety outside face can be improved further.

Claims (4)

1. the preparation method of angle brace welding point outside face, outside this face, angle brace welding point possesses substrate, gives prominence to from the surface of this substrate and the gusset in the wide w direction that is plate, the direction vertical with the surface of described substrate and fillet welding portion, it is characterized in that,
Otch processing is carried out to one end of the described substrate-side of the end of the plate length direction of described gusset and forms the notch of the cut angle θ of less than incision length x and 80 ° of the cut height a of the plate width direction with described gusset, the plate length direction of described gusset
Described gusset is configured, with the long d of predetermined leg of described gusset side in the mode that the end face in the described plate wide w direction with the described gusset of described notch is relative with the surface of described substrate 2be 0.8d with described cut height a 2≤ a≤0.9d 2mode carry out fillet welding, the long d of leg of described gusset side 2' be the thickness of slab t of described gusset 2more than 1/3, and, form the long d of this leg 2', the long d of leg of described substrate-side 1', fusion penetration length x ' and fusion penetration angle θ ' meets x '+d 1' > d 2the described fillet welding portion with boxing portion of '/sin θ ',
Shock treatment is implemented to the weld toe of the described substrate-side in boxing portion at least described in described fillet welding portion.
2. the preparation method of angle brace welding point outside face as claimed in claim 1, is characterized in that,
Described cut angle θ is more than 45 ° and less than 75 °.
3. an angle brace welding point outside face, it possesses substrate, give prominence to from the surface of this substrate and the gusset in the wide w direction that is plate, the direction vertical with the surface of described substrate and have the fillet welding portion in boxing portion, it is characterized in that,
Notch is provided with in one end of the described substrate-side of the end of the plate length direction of described gusset,
In the described boxing portion in described fillet welding portion, with the long d of predetermined leg of the cut height a of described notch and described gusset side 2for 0.8d 2≤ a≤0.9d 2mode fillet welding is carried out to described notch,
The long d of leg of described gusset side 2' be the thickness of slab t of described gusset 2more than 1/3, and, the long d of this leg 2', the long d of leg of described substrate-side 1', the fusion penetration length x ' of the plate length direction of described gusset and fusion penetration angle θ ' meets x '+d 1' > d 2'/sin θ ', and in described fillet welding portion, the weld toe of the described substrate-side at least described boxing portion is formed with shock treatment vestige.
4. angle brace welding point outside face as claimed in claim 3, is characterized in that,
Described fusion penetration angle θ ' is more than 30 ° and less than 75 °.
CN201080037246.6A 2009-08-24 2010-08-24 Angle brace welding point and preparation method thereof outside face Active CN102481652B (en)

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JP2009193201 2009-08-24
JP2009-193201 2009-08-24
PCT/JP2010/064240 WO2011024784A1 (en) 2009-08-24 2010-08-24 Out-of-plane gusset welded joint and fabrication method thereof

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