Spot of large board of building steel structure solders technology

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  • source:KAIHER CNC Machining
[summary] the use case that at present through the analysis home builds steel structure large board reachs the article the characteristic that the spot solders, introduced commonly used spot thick board solder craft and quality assure measure. One, building steel structure is thick board at present domestic steel structure builds the general situation 　 that the spot solders to appear in great quantities, the dosage that builds steel structure takes the throughout the country year the scale of steel output increases ceaselessly, the dosage that built steel structure 2005 is 15.8 million T, predict to achieved 26 million T 2010. In a lot of freeboard layer buildings and big span building, build modelling and the demand that the structure designs to satisfy, use large board in great quantities (point to above of 30 ～ 60mm commonly) reach exceed large board (point to 60mm above) commonly. If the home of construction exceeded Shenzhen of edifice of high-level steel structure the first times to develop a center 1986, the biggest ply achieves its steel column 130mm(sees graph 1) ; The board of edifice of commerce of Shenzhen ground king of construction is the biggest 1994 ply 100mm; The board that the center of Shanghai round-the-world banking that sealed a top 2007 uses is the biggest ply is 100mm, among them the 60 ％ above that dosage of 40mm above armor plate occupies steel structure gross; In the project of location of CCTV new station that build thickness of the biggest board achieves 110mm, the casing outside its uses board of 60 ～ 100mm in great quantities in canister structure, thick board the 70 ％ that occupy steel structure gross about. Because get the spot the removes heavy ability and traffic condition restriction of perpendicular facility for transporting, if component of many steel structure weighs girder of profiled bar column, train in excess specified length, large truss to wait to need the with loose mail form after section is articulatory to carry the spot, undertake assembly to these component in the spot next, arose to the position that press in section many thick board the spot solders. Solder at the factory relatively, thick board the spot solders have the following characteristic: (The work environment that 1) spot solders is opposite poorer. Because the spot solders,belong to the exercise outdoor, and the time span of average project construction is bigger, the spot solders the transition that exercise needs to experience winter and summer, encounter the influence of the adverse weather condition such as person wind, rainstorm and smoother possibly still. It is especially in construction of freeboard layer steel structure, the work environment humidity of headroom is big, wind- driven big, temperature is low. (2) spot solders the position gets the limitation of circumjacent environment, solder difficulty is greater. Because once component part installs perch, solder the position is unalterable, and when cannot resembling soldering in the factory, can use drive a vehicle to reach solder work platform undertakes retroflexioning reaching conversion to component part. (3) spot is thick board solder fill amount is larger. Be like the welding line with a long 1000mm, board thick 100mm, use CO2 gas to protect solder, need solders continuously 6h. In recent years, the spot is thick board solder to use gas of CO2 of medical core welding wire generally to protect solder. Solder of protection of gas of CO2 of medical core welding wire holds gas concurrently to protect solder and manual solder the advantage of two respects, technical properties is good, easy efficiency of operation, construction is tall, the 3 ～ that are welding rod arc welding 4 times, metallurgy reacts good, brilliant asks perfect, technical properties corrode function and microtherm concussion function all idealer; Especially arc is firm, splatter little, welding line figuration is smooth and beautiful, frit apply efficiency is tall, can amount to 75 ％ ～ commonly 85 ％ , and apply to whole place solder. Thick board the spot solders most common weld defects is lamellar tearing is mixed solder crackle, the commonnest construction quality problem is solder is pressed had been out of shape big. 2, the spot is thick board solder typical technological process and commonly used welder art 1.

The spot is thick board solder 　 of typical technological process is made to fall thick board the quality that the spot solders, ask according to the graph 2 shown typical technological process undertake construction. 2.

Girder is thick board the spot solders the girder of construction of building of 　 of commonly used craft uses box form commonly or H form is sectional in span the big, position that accepts muscularity, the fluctuation ala of girder predestined relationship board is thicker, the girder that carries length restriction more than needs to be in spot butt joint. Girder is thick board of predestined relationship of the ala when soldering solder the position is horizontal position normally, of celiac board solder the position is vertical position welding normally. Consider difficulty of the exercise that admire solder is greater, and thick board soldering welding line stuff is old, if do not have special requirement, on, issue what alar predestined relationship all should use flat position welding to solder the position; If girder is box contrast stop and, can use end face put in a skylight-leave a blank in a publication to show that sth has been censored or be in the way that celiac board flank opens manhole uses welding line of butt joint of predestined relationship of the ala below solder. 3. Steel post is large board the spot solders position of butt joint of column of steel of 　 of commonly used craft uses groove of unilateral V form commonly, because steel column has the demand that installs verticality, soldering so the means construction that should notice to adopt semmetry to solder in the process. To the abdomen board, alar predestined relationship all post of larger H form steel, board appropriate uses its edition double groove, celiac board solders first when soldering, solder again alar predestined relationship. 3, the spot solders quality assures measure 1. The solderer grooms 　 is thick board the level of the quality that the spot solders and handlers and carry out solder the ability of craft has immediate concern. The raw material as a result of every project and structural characteristic all not identical, before start working, even if the solderer of effective solderer card also must have hold of specific aim solder groom, in order to be familiar with the character of spot work environment and mother capable person. 2. The raw material of component of steel structure of 　 of raw material quality and solder the quality of material is to make sure the spot solders the foundation of quality. As a result of thick board the spot solders contact is put generally in the characteristic with cabined great stress, receive a form to fall one after another in T form, horn especially (thick turn column of H form steel, roof beam, box box column, bridge) lamellar tearing phenomenon is highlighted particularly. Besides having a demand to A of grade of rolled steel quality, B, C, D, still can raise a requirement to the Z tropism of material (refuse lamellar tearing order and degree -- Z15 of material section shrinkage, Z25 and Z35) . Before the spot solders, construction unit answers welding line groove the limits of two side 100mm undertakes ultrasonic flaw detection, in order to ensure welding line quality. 3. Offer spot of relatively good work environment 　 thick board because fill amount is large,solder, should ensure a welding line can solder usually finish, avoid midway stand, so the spot solders operation platform and defend of canopy build hair demand taller. The requirement solders in the spot place uses tailor-made profiled bar to wear or scaffold steel tube undertakes building setting, platform bottom spreads gangplank completely, net of fire prevention asbestine is enclothed above gangplank, solder operation platform periphery establishs skirting board, prevent small object to fall. Soldering platform periphery and coping, build fortify to protect canopy with fire prevention material, the requirement defends canopy coping not leak, periphery is not slack, return the exterior load with can bear certain. 4. Before carrying out solder strictly, the rolled steel that the 　 of heat treatment craft after solder reachs above to Q345 level, be in board thick below the case that surpasses 30mm, the demand carries out JGJ81 strictly, the warm-up before the solder of 2002 regulations and requirement of solder postheat processing. Below the case that permits in the condition, should preferential choose report to heat before the technology undertakes solder, the heat treatment after solder. 5. Use solder suitably because ordinal 　 is thick board solder hot input amount is large, solder contractive amount is larger also. Be like alone steel column to independent component, appropriate area uses the means that two-men semmetry solders to undertake, the verticality after preventing steel column solder exceeds normative requirement. Solder to complex truss spot, the requirement goes all out in truss whole outfit after finishing, begin to solder, solder overally ordinal appropriate from which to all around spread out, avoid next soldering undertaking to form the circumstance of the tie in periphery as far as possible. If Shanghai is round-the-world,the soldering that financial center periphery takes shape truss to if the graph shows 3 times,use undertakes soldering orderly: First quarter is right press node 1 → node 2 → node 3 → node 4, enter last quarter next: Butt joint node 2 → of 1 → node 3 → of node node 4, celiac lever from which the ministry applies solder to two end, and celiac lever solders when two end are different up and down. 6. Strengthen solder the process is out of shape the 　 that monitor solders mediumly the installation quality that although can affect component part,is out of shape, but also can use. Solder in the spot before exercise, the solderer should realize the mounting error of component part ahead of schedule, use appropriately solder be out of shape eliminate partial mounting error. To more important component part, after be being finished to avoid to solder, had been out of shape big, soldering in exercise process, should to soldering the structure undertakes synchronism is monitored, once discovery is out of shape,exceed bid, should adjust in time solder ordinal or solder speed, in order to assure quality of final steel structure construction. 4, steel structure of epilogue 　 building is thick board the spot solders quality is crucial to building structural safety, appear easily in construction process quality problem. Construction unit is soldering should ensure above all before exercise the qualification of raw material, do good welder art assess experiments, the work environment that is aimed at the spot undertakes the solderer grooms, strengthen solder the management of unit process of cargo bandling. In raw material eligible premise falls, solder according to what pass assess qualification by eligible solderer craft construction, thick board the quality that the spot solders is to be able to get assuring certainly. CNC Milling