Girder of big bridge of Sun Kou Yellow River rectifies what body segment nods to solder technology

Label of 583 　 document piles up: Number of article of A 　 　 : N Chang-mao(Baoji Bridge Plant of 　 of 1003-4722(1999)02-0044-02 The Welding Technique Of Steel BeamMonolithic Gusset For Sunkou Yellow River BridgeSU, baoji 721006, 　 of China) 　 Abstract: In This Paper, the Welding Characteristics Of Monolithic Gusset For Sunkou Yellow River Bridge Were Introduced.

By Use Of Welding Technique, such As Tack Weld Difference Thick Butt Welding, angle Welding Fillet Welding And The Gusset Plate Welding Of Longitudinal Level Bracing, some Problems, for Example, undercut, flume And Ditch, hot Crack, burn Through And Lack Of Fusion, which Was Caused By Angle Welding Were Eliminated.

By Rational Welding Sequence, the Manufacture Precision And Welding Quality Of The Monolithic Gusset Were Ensured.

Key Words: Yellow River Bridge; Steel Bridge; Tack Weld; Butt Welding; Fillet Welding; Gusset Plate; Big bridge of Yellow River of mouth of preface grandson of Monolithic Gusset;welding Technology1 is Beijing 9 lines judge water - below crewel of a railroad bear type does not have solder of bolt of node of whole of type of joist of perpendicular lever triangle successive joist bridge, span is 4 × 180 M, in all 4 couplet. Integral node is the new structure that home uses first, have economic rolled steel and high strenth bolt, be helpful for the advantage such as building site erect, the development direction that will be henceforth. Integral node is tectonic and complex, welding line is concentrated. Have butt joint welding line already, have welding line of edges and corners and fillet weld again, solder quality demand is high, succumb intensity control is tight, soldering butt joint, edges and corners still exists to receive frit in the experiment deep reserve is insufficient, solder of edges and corners has groove, bite edge, high temperature crackle and burn wear wait for a problem. Below factory of treasure chicken bridge and the joint efforts of concerned unit, make the problem gets settlement, ensured solder quality, shift to an earlier date a many month is finished. 2 Sun Kou Yellow Rivers are big the welder of the bridge art consider 2.

1 solder the main technique index of contact: Horn of S(B)+100 (MPa); of σ of S(W)= of butt joint σ receives S(B)+120 (MPa); of σ S(W)= σ all sorts of soldering the 3 areas of contact - 25 ℃ , AKV ≥ 48J(35J) . 2.

2 welder art study pair of SM490C steel butt joints, edges and corners is received, horn receives welder art undertook study. Mix with welding flux of welding wire of optimized H08MnT or H10Mn2, H08MnA, SJ101 solder craft applies solder all sorts of soldering contact, measure according to the technical index after editing, be informed H10Mn2 welding wire to be able to satisfy butt joint, edges and corners to receive technical index to ask, h08MnA welding wire can satisfy the requirement of index of horny connect technology. Soldering in the process, lay in insufficient welding line greatly to frit, be spent through changing character of groove dimension, groove and adjust solder parameter, make got ameliorative; The groove to welding line of edges and corners and problem gnawing an edge, through changing welding wire to tilt angle and welding wire aim the place, adjust solder ordinal, make got settlement; The high temperature crackle that arises to the 1st welding line of welding line of edges and corners, through changing groove size, reduce solder electric current, decelerate speed, raise arc to press or protect solder render with CO2 gas, those who make got settlement. Big bridge whole body segment nods 3 Sun Kou Yellow Rivers solder 3.

The whole body segment that staff of string of fluctuation of Yellow River big bridge uses the tectonic Sun Kou of 1 whole node is nodded, it is the abdomen that takes node by 2 board, 6 2 cover board, clapboard and inside maintain board, node of contact board, smooth couplet board, all sorts of join board wait for component composition. To save rolled steel, lid, abdomen board is become by the armor plate joining together of different measurement and different ply. 3.

2 solder 3.

2.

1 tack welding is ensure the mutual position of the component before solder, prevented component dump to undertake tack welding. Because way of tack welding solder is short, cooling rate is rapid, solder strong organization of temper by dipping in water of easy generation of hot influence area, form cold crack thereby. For this, solder with groove of inclined Y form cracking test legal system decided the warm-up temperature that prevents cold crack. Tack welding uses the amount that contain hydrogen the E5015 with low, can good crack resistance is commonly used low hydrogen welding rod solders. By the side of the bite that prevents small solder foot to do not affect frit to be mixed greatly, the with small solder foot tack welding inside groove uses  φ 3.

The welding rod of 2 Mm, the others uses welding rod of  φ 4 Mm. To prevent the cold crack of tack welding, right thick board tack welding length must ≥ 80 Mm, to thin plate must ≥ 50 Mm. 3.

2.

On node of whole of 2 butt welding, the lid of last quarter lever, abdomen board is become by the armor plate butt joint of different measurement, different ply. This craft applies first on string staff, be opposite to ensure the tenacity that receives contact, chose contain the  φ with tall manganese H10Mn2 of 5 standards welding wire and SJ101 welding flux. Solder with what optimize parameter applies solder all sorts of butt joint connect (see) issueing a list. Bring arc to try board data proof: The mechanical function of all sorts of butt joint connect all satisfies technical index to ask. Butt welding chooses MZ-1-1000 welder to apply solder. This welder is in when encountering tack welding, arc pressing is changeless, electric current is reduced automatically, cannot fuse tack welding, the frit that affected butt welding severely is appeared and the stomatic transgression when tack welding, increased to enrage the measure of dig clear root with carbolic arc for this aborning. Watch butt joint, edges and corners is received, horn is received solder parameter receives head dummy form welding flux of Mm of diameter of compositive board thick welding wire solders V of parameter solder number of channels warm-up of M*n-1I/Au/VV car M*n-1 / ℃ layer is lukewarm / dip of ℃ welding wire / (° ) 185SJ10111 of ～ of butt joint 16+16.

20 ≤ of the 5 ≥ that do not have ～ receive 　 of 28+28 ～ 325SJ10125 135 pairs 3528 ± of 730 ± 131 ± 121.

20 ≤ of 5 ≥ receive 32+365SJ10125 　 135 pairs 3528 ± of 730 ± 131 ± 121.

20 ≤ of 5 ≥ 135 edges and corners 710 ± of 　 of 365SJ10112 of ～ of 24 ～ 28+24 131 ± of 3528 ± 121.

20 ≤ of the 5 ≥ that do not have ～ 710 ± of 　 of 365SJ10112 of ～ of 28+32 of 13520 edges and corners 131 ± of 3528 ± 121.

20 ≤ of 5 ≥ 13520 edges and corners 710 ± of 　 of 365SJ10112 of ～ of 20 ～ 24+20 131 ± of 3528 ± 20 ≤ of the 125 ≥ that do not have ～ 13520 edges and corners ～ of 16 ～ 20+20 281.

260 ± of 25SJ10111 　 3532 ± of 20710 ± 231 ± 121.

5 ≥ 13520 horn receive 20 ≤ of the 60 ≥ that do not have ～ 365SJ1011168 of ～ of K=1216 ～ 32+16.

3531 ± of 5750 ± the 118 ≥ that do not have ～ 20 receive 285SJ1011162 of ～ of K=1016 ～ 20+16 without horn.

3530 ± of 5730 ± 119.

The 5 ≥ that do not have ～ 20 without 3.

2.

3 edges and corners receive the edges and corners of integral node to receive department home to apply first, chose contain the H10Mn2 of standard welding wire with tall manganese and SJ101 welding flux, solder with what optimize parameter (1) seeing a table applies solder connect of all sorts of edges and corners, each mechanical function all satisfies technical index requirement. Because welding line of edges and corners is long, cover board has the turn other treatment, lever have solder be out of shape cause assemble clearance local out of tolerance, hot crack is contained in the armor plate because of composition again sensitive element Nb, ever appeared in the 1st welding line solder slants, burn wear and high temperature crackle, affected welding line quality severely. Put in the problem in the light of above, adjust orbit and position of welding wire alignment meticulously to adding the rigid orbit of outfit to adopt, shorten solder head freedom swings to prevent solder to slant highly. Adopt to occurrence clearance out of tolerance manual solder render is used in clapboard place, the others place reduces clearance compulsively to prevent to burn with clamping apparatus wear. Solder with what reduce the 1st welding line electric current, decelerate speed, raise arc pressing, improve coefficient of welding line figuration, the field trash of low melting point that makes welding line medium easily rise, avoid high temperature flaw. The problem with deep to frit insufficient reserve adopts the φ that use  3.

The welding rod of 2 Mm undertakes tack welding, the operation method that improves CO2 gas to protect solder and limitative v height will ensure frit is deep. 3.

2.

4 fillet weld 　 (1) is buried automatic solder uses arc to solder on integral node, of the fillet weld of predestined relationship leaving a wing of last quarter lever and first quarter lever on fillet weld of alar predestined relationship. Welding wire chooses H08MnA, welding flux chooses SJ101, solder with what optimize parameter applies solder all sorts of horn connect, each mechanical function all satisfies technical index requirement. On, the fillet weld of predestined relationship leaving a wing of last quarter lever has become sectional, apply solder easy solder to slant with MZ1-1000 welder, adopt adjust welding wire meticulously to aim the position to prevent. Difficulty of welding line of edges and corners is great, to reduce the workload of this kind of welding line, the edges and corners that designs staff of admiral first quarter seams instead fillet weld. To save rolled steel, reduce the height that reachs limb as far as possible, the factory designed welder bracket. (2) manual solder is used solder smooth couplet node board, clapboard, maintain board and welding line of contact board isogon. Welding rod uses E5015, the diameter is  φ 4 Mm or  φ 5 Mm two kinds. 3.

2.

The solders to rectify body node to ensure orderly welding line quality of 5 whole node and production precision, rise solder efficiency, formulate solder reasonably ordinal. ① decreases to make the component can contract freely solder leftover stress, butt joint of lid, abdomen board undertakes on unit. On ② , after last quarter lever forms groovy body, solder fillet weld of predestined relationship of ala of the two termination inside groovy form and clapboard fillet weld, solder to reduce be out of shape, direction of welding applies solder from extroversion inside. On ③ , after last quarter lever forms box body, make the production precision of body node to ensure, first solder fillet weld of predestined relationship of ala of two termination inside, again welding line of solder edges and corners, fillet weld of predestined relationship of the flank outside final solder. ④ other component and first quarter make the same score couplet after node board is assembled solder. To ensure welding line quality is mixed the flatness of cover board of node board place, improve groove measurement and first fillet weld of the side outside node of solder smooth couplet, solder next smooth couplet node board node of inside fillet weld, smooth couplet board and maintain board fillet weld, correctional hind again solder cover board and maintain board fillet weld. To improve smooth couplet node board carries a fatigue intensity, except end the ministry is repaired hammer still increased to attack outside grinding divide evenly to arrange. 4 conclusion 　 (1) solders with what actor chooses material and solder craft applies solder all sorts of soldering the multinomial step that takes in contact and production makes welding line shell beautiful, in-house quality is good, flaw detection percent of pass obtained butt joint welding line 99.

85% , flaw detection percent of pass obtained welding line of edges and corners 96.

43% , horn receives welding line flaw detection percent of pass was achieved 99.

13% . Exceeded the history best level. Each mechanical function all satisfies technical index requirement. (The butt joint of 2) whole node, edges and corners receives peaceful couplet the hammer of upright ministry attacks node board to still be belonged to in our country apply first, this new technology already was close to international advanced level. CNC Milling CNC Machining