Steel column, girder uses factory treatment commonly, the construction method of field assembly, to thick board solder to appear easily plank lamellar tearing, whole is out of shape (if bending, twist is out of shape) , the quality problem such as crackle of generation of contact stress concentration, welding line and slag inclusion, safe to steel structure use generation relatively influence.
Measure
Design phase is deepened in steel structure, to decrease thick board solder the quality problem of easy generation, from solder node design is made to component part with building site installation solders tectonic design undertakes elaborate design, design an unit to undertake be communicationed in detail with steel structure.
(1) solders node design
In T form, crisscross in reaching horn to accept joint design, when the ala ply of predestined relationship board is not less than 20mm when, make to avoid or decrease mother capable person board thick direction bears bigger solder receive contraction stress, appropriate adopts relevant node construction to design.
(2) component is made with building site installation solders tectonic design
The strong butt joint connect such as requirement welding line and mother capable person, the butt welding of two direction seams its freely, the space that appropriate uses crossing of; of T form across is unfavorable be less than 200mm, and the length that joining together expects and width are unfavorable be less than 300mm; to solder the fore-and-aft solder juncture of bridge of box form combination, column, appropriate is used solder completely appear or when the; of butt joint welding line that partial solder appears asks complete solder is appeared, should use pad bosseyed solder; bears only of dead load solder the fore-and-aft link welding line that sets H form bridge, post, become when celiac board ply is more than 25mm, appropriate uses what complete solder shows welding line or partial solder appears box of welding line; column and clapboard to solder, should use complete solder to show the welding line that welding line; receives to cannot undertaking arc welding, appropriate uses electroslag welding to receive, and semmetry of welding line appropriate is decorated. Joining together of installation of column of H form frame spells outfit connect appropriate to use excel in bolt and combine node or solder completely node, use solder completely when node, alar predestined relationship board should use lining of groove of odd V form to fill up complete solder to show welding line, if celiac board ply is more than 20mm, appropriate uses K form groove, column of; box frame should solder to install joining together to should use complete solder contact after opposite clear root, should use complete solder to appear welding line or partial solder to show welding line according to designing a requirement. Complete solder appears form of welding line groove to should use lining of groove of odd V form to fill up.
(Measure of 3) lamellar tearing control
Use double groove semmetry to solder replace bosseyed groove asymmetrical solder. Use low intensity welding rod to be inside groove mother capable person on board face first v plasticity is excessive layer. Use low hydrogen model, exceed low hydrogen welding rod or aeriform protection arc welding to apply solder. Raise warm-up temperature to apply solder.
(4) solders crackle is relevant precautionary measures
The cleanness that strengthens welding line groove works, cleared undertake to groove root ministry before the control; solder of temperature of the warm-up before all harmful material; strengthen solder roast, purify all moisture, humidity, reduce content of the hydrogen in welding line. Control penetration ratio: strictly? Courtyard of tip of gorge of herd of Yi V げ adds Piao of fine basement of of approach of You of that a pavilion or house on a terrace of of oily over sixty years of age to hire establish male excessive of of a surname of Lin of fish hawk of of where Fu graceful joke adds Yong saute to promote envy to seek male of Fu of a keeper of domestic animals of Tuo of of commission of soil Liu of ξ of our apricot have diarrhoea, mix to ministry of part of box body component part of the solder that bury arc heat thermal efficiency, computation gives line energy optimal limits is 13812J/cm2 - 40492J/cm2. Soldering actually in the process, take the intermediate limits cost of computational line capabilities, solder wiring energy should be controlled in 23 - inside the optimal limits of 37KJ/cm2. Achieve the input that controls solder wiring energy thereby, obtain control thick board solder the purpose of quality.
(5) solders be out of shape control measure
Thick board solder amount of metal of fill frit apply is large, solder hot input volume is high, reason is out of shape also big, because this needs pair of component to press craft condition strictly,the choice solders reasonably groove form, choose double groove form as far as possible, can bosseyed soldering welding line is chosen narrow clearance groove form, decrease solder hot input gross, can decrease effectively solder be out of shape. The choice solders reasonably method and solder craft parameter. Energy concentration and hot input solder inferiorly method, can reduce effectively solder be out of shape. Use CO2 gas to protect solder relatively welding rod arc welding is small much. Hot input quantity is the crucial factor that affects deflection, should solder after the method is affirmatory, can solder through adjusting craft parameter will control hot input to measure, in make sure frit is appeared and the premise with flawless welding line falls, choose small hot input as far as possible. The assembly with logical choice and solder ordinal. Can use subassembly - solder the component of the law, pass " break up the whole into parts, collect 0 to rectify " means, what can reduce the component part in the process that make effectively is rigid, be helpful for a component turn over solder, symmetrical solder, pass correctional to component metabolic, of component part of whole of can effective pare solder be out of shape. The welding line that can use solder symmetrically adopts semmetry to be the same as at the same time to apply solder, be in when welding line on the structure when distributinging asymmetry, if welding line is located in axis of component part neutral two side, the order that can solder to heat is inputted and apply solder alternately through adjusting undertakes controlling is out of shape. Adopt section to retreat solder to longer welding line law and jump solder law, prevent concentration of welding line local heating.
Measure of metabolic of spot solder relieve a garrison:
Soldering to be out of shape and control welding stress is in soldering, make sure component part solders the important facet of quality, this project adopts be out of shape control measure has: ? Mian of of Xi of of sunken dark Kun spends dark blue the solder interface of?8mm of source bamboo-plaited basket or suitcase, can add set wide bolster plate, the groove that standing by capable person of rolled steel mother at the same time undertakes soldering filling seaming, root gap amounts to 6 ～ 9mm, after welding line burnish is finished, still can undertake flaw detection with UT equipment, undertake soldering till the ability after certificate of proof. Be less than the solder mouth of 3mm, can use oxygen - acetylene blaze undertakes enraging dig or cut is handled, repair standard groove thereby, make sure clearance accords with a requirement finally, after finishing, add set craft bolster plate. Horn connect, adopt uneven pattern to undertake repairing, achieve even status finally. When soldering, assure to be in as far as possible lesser cabined spend next soldering. Adopt semmetry to apply solder, reduce solder be out of shape.
