Pipe welding jobs

The plan of a chassis of bicycle?atto with the aid of a CAD.Il program first step, before this?nel case of a realization of bici on measure for a single ciclista, the determination of the 4 quotas principali:.L' experience of the planner and the collaboration of the athlete will make the rest. With program CAD the design in 2D is obtained with the constructive quotas the future chassis. Finished to the plan and chosen the tubes it is passed to the practical realization. Similar faithful of the jobs?l bench. E' important the height of the vice in order to work badly with comodit?enza of back, the former distribution of the tools pi?n use and one good lighting system. The blocking of the?ltresi tubes to the important vice. use of ganasce in Nylons cut of usual to V must be made that lock the tube in 4 zones without intaccar it. The job begins with the positioning on a horizontal mask, of the box it of the Bottom bracket them. Cilindrica(per tig or filletbrazed), its mezzeria determines the longitudinal plan (longitudinal axis) of the chassis and all the bici. All the quotas positioning of the tubes make reference this part. It then follows the positioning of the tube steering, cut and rifinito to measure like from plan. Also the positioning of the tube steering?olto important perch?oncorre to determine: the longitudinal axis of the bici, the angle steering and therefore of the bici same, and the distance saddleback handle-bar that is the position of the ciclista. It begins therefore the job on the true and own tubes. The first tube that job?quello oblique, that it goes posizionato between the box of the movement and the tube steering. For the steel the characteristic diameter?8mm. with aerofoil of several shapes (. Job before the estremit?ella scato it movement (diameter 40 milimeter), in order then to pass to the other for a perfect connection. The difficolt? in coupling perfectly the tubes (a greater light of 0.5mm renders the Tig welding difficult) posizionando the tube symmetricalally to the longitudinal axis of the bici with reinforces of its estremit?en distributed. Not?uindi fast this job. In order to work the tubes I make use of a used column bottoming drill as fresatubi.L'?elicata operation perch?e does not place attention, easy cutter strands in the tube. The advance of cutter?olto slow. The number of turns medium between 360 and 250 gg/min. Finished the milling, rifinisco to lima the estremit?per to arrive to a precise connection with minimal light. The connection of the oblique tube?orse the pi?mportante (is all important) perch??ui that hours for estremit?a preparing pass greater to every employment 1-1,5 sforzi.Mediamente. The continuous job until obtaining the approach of all the tubes, also with the forcellini posterior. The forcellini posterior beyond to having several shapes, they can possess various types of graft, that is of way to be connected with the vertical and horizontal posterior tubes. The forcellini in aluminum they are plates and, they knit Tig with the tubes that come cut to you so as to to come near to the forcellino. Those in steel can be all plates, or to inner graft, or to graft esterno.I first they are the pi?conomici and they come knits to you to the tubes with brazing to ottone.Ci?erch?on the?ossibile brass to fill up the large space that exist between the forcellino and the tube. Instead in the forcellini to graft, the estremit?el forcellino enfilade inner or externally to the tube comes, knitting with sweet brazing in silver alloy. If the precise graft?olto, alloy batons must be used also with 40% of silver (550.C like point of fusione), than being fluid, garantir?na good union. The last tubes that job before the welding, are posterior verticali.L' the union of these tubes, little under the node saddleback, to pu?ichiedere of the not easy job if it is decided to very approach the two tubes in their intersection. If these last tubes, generate one laborious union to knit, then beginning the welding just from these tubes. In realt?onviene always, to aim the box it of the Bottom bracket them to the tube piantone, in order then to pass to the rest. With the weld, that it means to generate welding points on the perimeter where avverr?a welding, the tubes are prepared for the definitive welding. The Tig welding of the steel I carry out it in two is made main: the welding of the main triangle, and the welding of the posterior linings in secodo a time. E' a not obligatory operation, but that it supplies. a weld pi?ffidabile.Anche the weld?n operation not to underrate welding totally Seat stayses to tube piantone TIG (tubes steel). The sequence and the place where it is decided to execute a welding point?mportante for assialit?el the telaio.Questa mask has three aces of spin. For the steel this hard operation approximately 2-2,5 hours. In the photos over and to side two front triangles of the chassis are looked at during the welding. The several spins of the mask, allow to complete all the weldings without never to take apart the triangle and being always seated approximately in the same place. The gas of inner protection, on one side enters of the box it of the Bottom bracket them. Finished the Tig welding of the main triangle, I move, newly all in the horizontal mask where posiziono the horizontal linings and the forcellini. Always making to flow nitrogen to the intrerno of the tubes, with the torch tig, point and balance the linings orizzontali.Dopo the weld, the welding of these linings?atta liberations also for problems of accessibilit?ella torch. Finished to the welding, making reference to the forcellini, it mounts to you on the appropriate support, I must realign to force on the vice, the linings to the grafts goddesses forcellini.Anche these last members are knits Tig.La to you brazing of these last ones happens with alloy to 40% of silver, in optimal way to have fluidit? low temperature. All the brazing operations happen with tube ossiacetilenico.Non have photo of this last operazioni.Dopo control with a truschino on the mounted Rim, correct assialit?ella the same wheel, limando opportunely the forcellini. There?ncora then, the rifinitura and operation pulizia of brazings from slags, with limette, of the brazing cords. I have begun to work with the aluminum in 1999, buying one welder. TIG that works also in alternating current. Working with the aluminum?i?acile to become account of the happened one that it has ago avuto.Se until 3 years the steel was still the main material of the chassis, hour?uasi introvabile.Nel agonistico, single field in the mountain bike. ?ncora present in the chassis of some square, probably for its dowries of elasticit? affidabilit?el field road, to the Italy turn the 2000 steel?comparso. Saying in clear terms, to construct a chassis in aluminum (with tig)?olto. pi?acile and fast that to then construct it in acciaio(sempre with tig).Se the result?n pi?eggero chassis and pi?igido, then?atto 13, (you go hour to the page aluminum)