Of car component cast-iron solder frit deep method

Cast-iron spare parts is treatment precision mostly the fundamental spare parts with tall, high price, frit is deep if testing system microscope enrages housing of lid of cylinder body, air cylinder, transmission to wait. Solder cast-iron spare parts is making frit deep measuring instrument in reaching use process, solder frit deep analyzer appears via regular meeting the circumstance such as crackle, stomatic, attaint. According to statistic, solder frit is deep measure systematic car to be below normal use circumstance, when this kind of spare parts reachs wear limit, its size variation has 0 only.

08 ％ ～ 0.

40 ％ , loss of quality of measuring instrument of deepness of welding line dissolve has 0 only.

1 ％ ～ 1.

8 ％ , microscope of deep measuring instrument of welding line frit discards as useless the spare parts right now, it is very wasteful undoubtedly. Accordingly, consider and use repair experience advancedly, reasonably repair is cast-iron the spare parts is necessarily. Soldering is a kind of effectively rehabilitate the method of cast-iron spare parts. Cast-iron the quantity that contain charcoal tall, impurity is much, have plasticity low, weldability is poor, sensitive to cooling rate wait for character, pressure vessel solders frit is deep detect after solder fills appear easily to white mouth is organized and produce crackle. Solder frit is deep detect the technology uses to improve the solder of cast-iron spare parts quality, can adopt the following method. 1. Before solder of the law that heat up solder go to workpiece whole or local warm-up 700 ℃ of 600 ～ , solder frit is deep detect in process of example filling solder not under 400 ℃ , slow refrigeration reachs room temperature after solder. Use hot solder law to be able to be reduced effectively solder the difference in temperature of contact, solder analysis of frit deep blemish reduces stress thereby, return the plasticity that can improve cast at the same time, prevent to appear white mouth organization and crackle. Solder commonly usedly the method is gas welding and welding rod arc welding. Solder gas welding of frit deep detector is commonly used and cast-iron gas welding silk, be like HS401 or HS402, deserve to use welding flux CJ201, divide oxide in order to go. Boiler solders method of warm-up of gas welding of frit close analysis is comfortable at filling solder is medium or small Bao Bi spare parts. Welding rod arc welding chooses cast-iron core Z208 of cast-iron welding rod of Z248 of cast-iron welding rod or steel core, solder frit deep dimension examines measure this law to basically be used at filling solder ply is bigger (the dissolve of cast-iron spare parts that is more than 10mm) is deep testing system. Of hot solder law solder equipment basically has fire of heating furnace, solder, pressure vessel to solder frit is deep measure electric stove (oily furnace or ground furnace) etc, 2. Cold welding law this method is incorrect workpiece undertakes warm-up before solder, frit of soldering butt joint connect is deep detect or warm-up temperature does not exceed 300 ℃ . Arc welding of commonly used welding rod undertakes cast-iron cold welding. Solder the requirement of frit deep measuring instrument according to cast-iron workpiece, can choose different cast-iron welding rod, video solders frit deep measuring instrument is like filling solder face of treatment of blame of spare parts of general casting pig chooses Z100 welding rod, casting pig of filling solder high strenth and spare parts of nodular cast iron choose Zll6 or Z117 welding rod. Solder frit is deep of law of testing system cold welding solder equipment is common arc welding device, 3. Heat decrease should solder law this method is do not heat beforehand weldment, conduit frit is deep analyse testing system and mix before applying solder weldment heats in applying solder " heat decrease should area " , car spare parts is hot board solder detect make its not the systole of block up welding line, reduce internal stress thereby, avoid to produce crackle. Car component seat connector solders dissolve is deep detect heat decrease the area can choose one place or should be in more, its choose a principle to be: Deep measuring instrument of dissolve of 1) welding line should be the place that block up welding line expands. Heat when this place when refrigeration, make welding line has obtain freedom to heat expands and may measure the microscope with welding line deep dissolve of cold systole. 2) solders frit appears force to detect should be not as much as other place connection and the position with larger intensity. Of 3) oneself be out of shape to other place should not have very big impact, unapt be out of shape because of it and attaint other place. CNC Milling CNC Machining