[solder common sense] the laser beam welding that sees metallic data more receives character

Laser beam welding receives those who apply to a variety of data to solder. The high power density of laser and tall solder speed, make area of laser welding line, hot influence very small. Hold better change regulation, OK what the basis arranges to welding line is different the chemical composition that the request will come to adjust welding line, solder through control the condition can obtain function of first-rate welding line.
1. carbon steel
Mild steel and low-alloy steel have better weldability, when but choose laser beam welding,be being received, the quantity containing carbon of the data (carbolic equivalent C) ought not to prep above 0.25 ﹪ . Carbolic equivalent computation is formulary: C=C%+Mn/6%+Ni/15%+Cr/13%+Cu/13%+Mo/4%
Surmount the data of 0.3% about carbolic equivalent, solder cold crack tendency can be increased, what welding line considers in the program is sure shorten quantity, be helpful for dropping welding line and the remaining stress that heat up influence area and crackle tendency. When carbolic equivalent is more than the data of 0.3 ﹪ and carbolic equivalent to be less than the data of 0.3% to solder together, choose slant the change that means of buy welding line is helpful for restraining martensite, cut down the happening of crackle. Data carbon equivalent is surmounted 0.3% when, it is OK also to reduce temper by dipping in water to be spent at top speed reduce crackle liability.
Galvanization steel, the vaporization temperature because of zinc (903 ℃ ) the melting point that compares steel (1535 ℃ ) many low, soldering rising of the zinc in the process, make welding line produces austere stoma, consequently difficult choose laser beam welding to receive, penetrate especially solder, the experiment chooses the space that sets 0.1mm between fluctuation data nowadays, from steam of zinc of the let slip in space, but interstitial in actual production operation contrast is hard.
Sulfur and phosphorous content to soldering crackle has sure effect, contain sulfur content prep above when the steel laser beam welding of 0.04 ﹪ receives 0.04 ﹪ or prep above of the quantity that contain phosphor, brief single shot gives birth to crackle.
The volume containing carbon that because its are outside,appearance carries the steel that cementite processes is higher, caky crackle and fix crackle happen very simply in cementite layer, general not applicable laser solders.
2. stainless steel
The coefficient of thermal conductivity of austenite stainless steel wants the 1/3 of carbolic steel only, steel of specific absorption carbon is tall. Consequently, austenite stainless steel can be obtained a bit deeper than general carbon steel solder frit is deep (deep 5 ﹪ - 10 ﹪ ) . Laser beam welding receives hot input to measure small, solder rate is high, special agree with of Ni-Cr series stainless steel solder.
The weldability of martensite stainless steel is poor, solder contact is general hard and fragile, have cold crack tendency. Soldering when the quantity that contain carbon is more than the stainless steel of 0.1 ﹪ , warm-up and temper can drop cold crack and fragile crack the tendency. Ferrite stainless steel, laser solders to be compared commonly other solder idea solders simply.

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