Solder metabolic analysis and control

Time:2023-06-20 13:42:18
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source:COCKRIEL CNC Machining

Develop as the high speed of industry of our country steel structure, solder the technology receives many application in steel structure project, welder especially the is out of shape the phenomenon also becomes people to pay close attention to closely focus of thick panel. Soldering in the process, solder leftover stress and solder be out of shape can serious effect makes a process, solder structural performance characteristics, solder of contact fight fragile break ability, fatigue intensity, fight stress to corrode ability of craze and craze of high temperature creep. Solder be out of shape appearance and tolerancepublic errand dimension, connect also can be endangered to install deviation in making a process and add groove space, make production process more difficult, the additional process that still needs to adopt a few take time to cost when occurrence problem will undertake redeeming, raise cost not only, appear possibly still from this the other and adverse element that working procedure brings. Accordingly, want those who get high quality to solder the construction must be controlled strictly to these phenomena. Welding stress analysis is fused when soldering, be produced below heat source action by solder metal local heating and fused, the mechanical function of material also can produce marked change, and solder the microstructure after hot process also decided welding line and solder of hot influence area directly, leftover stress and be out of shape size, solder so the accurate computation of hot process and determining is welding stress is mixed be out of shape analytic premise. Because this is soldering,the imitate of the process studies in, consider the impact of field of force of temperature field correspondence only, and oversight stress field is right the action of temperature field. In the meantime, the action of nonlinear, instantaneous and temperature dependency effect leftover stress that also can hamper correct description leaves generation in all sorts of circumstances, make the work of unified systematization is finished very hard. To make its simplification, actual middling classifies a system as a kind with the concept of weldability, will solder decompose for thermodynamic, mechanical wait for a process with microstructure, reduced weldability thereby the complexity of all sorts of phenomena. Fundamental general weldability decomposes the technology that the graph shows 1 times to be mixed for temperature field, stress be out of shape field and microstructure state field. This kind is decomposed in the light of solder leftover stress and solder processing of analysis of metabolic numerical value is very valuable. On narrow sense, weldability can understand the intensity function of a requirement again. The main factor that affects intensity performance includes chemical composition, photograph to change again microstructure, solder appearance of processing of postheat of temperature loop, solder, component, laden condition and hydrogenous content. Accordingly but will pursue 1 expand graph 2 change in order to emphasize the influence of behavior. Among them, graph 1 with the graph 2 medium arrowhead show mutual effect, solid arrowhead shows intense effect, empty arrowhead shows weaker effect. The change of microstructure decides the chemical part at material not only, also decide at process of its be heated (especially with solder the process that concern) , especially it is soldering the influence of the hot influence area of contact and fused area is more seductive. Graph 1 microstructure is spent with graph of field of meet an emergency of temperature, stress 2 patulous microstructure are mixed the correlation between field of meet an emergency of temperature, stress looks from objective law, instantaneous stress arises when component part solders, solder hind produces leftover stress, produce remains to be out of shape at the same time. But what ordinary people takes seriously in the process that make is control is out of shape, often adopt measure to increase by the tigidity of solder component, in an attempt to is reduced be out of shape, and the instantaneous stress that oversight adds meanwhile and solder leftover stress, right now component part is in pull stress crackle may appear even below action. Although did not produce crackle, component part also can be brought about to break in the course that leftover stress gets the internal force when carrying to be changed equably in the structure firm, be out of shape destroy even. The control because of this welding stress and eliminating is very important in the steel structure process that make. Solder be out of shape control is soldering in the process, thick board after butt welding be out of shape basically is horn is out of shape. Adopt control metabolic to send a standard commonly in practice, namely first the path of one part solder of solder front, retroflexion workpiece, the solder of opposite of the solder after carbolic dig clear root, retroflexion again workpiece, so such move back and forth. Generally speaking, solder every time can turn over after 3~5 line welding line, till solder is full each welding line of the front. Should observe when applying solder its horn is out of shape at any time at the same time circumstance, the attention prepares to turn over at any time solder, with as far as possible decrease solder be out of shape reach welding line internal stress. Additional, setting embryo clamping apparatus undertakes to component part the tie also can be controlled effectively be out of shape, this kind of method applies to abnormity commonly thick board structure, as a result of thick board abnormity structure modelling is peculiar, section, sectional dimension each different, below free condition, dimension precision assures hard, this needs the figure according to component part, clamping apparatus of the loose tool that make, be in component part fixed condition to fall to match into luggage, fixed position, solder, control then solder be out of shape. Outside removing above means, law of lower part of in order to also can prevent to solder be out of shape: 1.

Adopt solder reasonably to choose to solder reasonably with control orderly ordinal, it is the significant step that avoids welding stress, also be to prevent to solder be out of shape one of the most effective methods. Solder according to what differ method, make solder differently ordinal, the solder that bury arc uses converse law, degenerative method commonly; CO2 gas protects solder and manual solder to use dispersive and balanced method, even method; The work out solders reasonably sequential guiding principle is " dispersive, symmetrical, even, reduce cabined degree " . Nextpage2.

Adopt be out of shape instead the box form member with common to be being compared in steel structure project step, will go up, after predestined relationship board shows suppress 3 times to be out of shape instead by the graph, next alas undertake assembly. Graph the consideration that the 3 hot inputs in be out of shape signal is out of shape angle α can pass pair of welding line solder to receive a process instead instead measure will decide. After component part solder because solder,horn is out of shape phenomenon, can reach wing reply basically flat condition. The dominates control stress end of welding stress is to reduce the peak value of stress to make its distributing equably. Concrete step has the following kinds: 1.

Reduce welding line dimension to solder to internal stress circulates by local heating and be caused, we should be aimed at the plank of different ply, use double groove as far as possible, reduce welding line size. 2.

Reduce solder cabined degree cabined degree bigger, welding stress is greater, because this should make as far as possible,welding line is in lesser and cabined spend next soldering. When needing joining together batten like senior member, want to apply solder below free condition as far as possible, do not wait for when assembling again solder, answer to complete work of its joining together first, assemble component part all right again. If assemble hind again solder, cannot contract freely because of its, cabined spend big and generation is very large stress. 3.

Adopt solder reasonably soldering orderly below the condition of more assembly parts, should mix according to component part appearance of welding line decorate, adopt first solder systole measures bigger welding line, solder systole measures lesser welding line after; First solder is cabined degree bigger and the welding line that cannot contract freely, hind solder is cabined the principle of the welding line that spends lesser and can free systole. 4.

Use compensation to heat the law solders in component part in the process, solder to decrease hot input prediction of a person's luck in a given year is too fast, welding line produces the phenomenon of crackle in crystallization process, when board thick when achieving certain ply, it is certain that welding line periphery is answered before solder undertake heating inside limits, namely the warm-up before solder, heat temperature is inspected board equivalent of carbon of the thick material that reach a mother (CE) and calm. 5.

Make decomposing construction to should adopt branch to assemble to large construction solder to component part, part partly each to the structure namely construction, solder, after correctional qualification again general assembly solders. The elimination of welding stress we should take effective measures to control welding stress in producing the course that make actually, but to a few special projects or special component, still can adopt the following method to eliminate stress of component part remains further. 1.

Use pair of spare partses to rectify smooth eliminate stress armor plate to because be heated of cut edge place estimates big, cooling rate,be in in cut process fast, because this cut brim is put in greater contraction stress. Twist of the generation after medium, laminose cut is out of shape, it is the consequence that these stress release. To thick board, because its defy a turn sectional big, can't arise bend, but contraction stress is objective existence, can increase margins of pair of spare parts cut in whole smooth process accordingly grind repeatedly pressure, this is very advantageous to the elimination of the contraction stress of generation. 2.

Undertake local and roast release stress after component part is finishing in its two side have welding line back or welding line roast. This law aux used to is used at be opposite " T " body component part solders horny metabolic is correctional in, do not need to bring to bear on any outside force, component part is out of shape can be able to corrective. This shows wants control to heat only temperature and limits, it is very effective that more than stress returns this law offset. 3.

Use ultrasonic to shake eliminate stress supersonic concussion (UIT) fundamental uses high-power ultrasonic to drive a tool namely in order to be more than 20 thousand times / the surface of object of frequency concussion metal of S, as a result of ultrasonic high frequency, efficient the big energy that falls with focusing, make metallic surface produces bigger compression moulding to be out of shape, at the same time supersonic bow wave changed original stress field, produce what one destiny is worth to press stress, make be pounded place be able to aggrandizement. This kind of method is very effective to eliminating stress, supersonic concussion is shown 4 times like the graph. Graph 4 exceed unripe concussion to eliminate welding stress 4.

Using law of oscillatory effectiveness for a given period of time to eliminate the principle of stress vibration effectiveness for a given period of time is to give be brought to bear on by the workpiece of ageing treatment the cycle with consistent photograph of an as inherent as its syntonic frequency is stimulated brace up force, make its produce resonance, make workpiece achieves certain oscillatory energy thereby, make workpiece interior produces microcosmic plasticity to be out of shape, the ill-natured crystal lattice that makes cause leftover stress thereby by restore gradually to balance position, a fault of grain interior gradually slippage twines a hammer to plunge into afresh, make leftover stress is able to eliminate and leveling. Law of oscillatory effectiveness for a given period of time has cycle short, efficiency is tall and the characteristic of free from contamination, and do not accept the restriction such as work measure, appearance and weight, carry out a proof through many project, have apparent effect to eliminating workpiece stress. 5.

Use strong arenaceous the process that eliminates rust undertakes stress rushs elimination arenaceous when dividing rust, ejective iron sand bundle be as high as 2500MP/cm2, with iron sand bundle reach its to heat up influence area to relapse to component part welding line, even concussion, besides achieving the result that divide rust, eliminate to the stress of component part favorable result also reachs since the meeting. CNC Milling CNC Machining