Insufficient hardness of cold stamping die welding:
Reason: (1)
When the welding current is too large, the dilution ratio of the mold base material is too large, and the alloying elements of the mold base material are damaged.
Countermeasures:
Try to use small current and short arc welding. The amplitude of the welding rod when welding is not more than 1.5 times the diameter of the welding rod.
Reason: (2)
The preheating temperature and the interlayer temperature during welding are not controlled.
Countermeasures:
Pay attention to the preheating temperature (preheating temperature is mainly related to the carbon content of the base metal) and the control of the interlayer temperature during welding.
Reason: (3)
Excessive number of surfacing layers and improper selection of welding materials.
Countermeasures:
Select the welding material that is suitable for the number of layers to be welded. (Some welding material structures are directly high-hardness martensite structure, and some welding materials can be transformed from austenite structure to high-hardness martensite structure when surfacing is more than three layers.
Eppendorf tip refill is designed, developed and produced to perfectly match most brands of pipettes. The refill tower tip is suitable for most brands of pipetting systems to ensure pipetting accuracy. The sterile refill tower Pipette tip uses medical-grade plastic packaging to protect the Pipette Tips from contamination. The pipette tip refill is sterile, free of DNA, DNase, RNase, endotoxin or ATP. It can be autoclaved at 121 °C/250 °F (2bar) and sterilized by heat and humidity, in accordance with DIN EN 285. Environmentally friendly packaging. According to the IVD Directive 98/79, it has the European Union CE mark.
Compared with ordinary carton packaging, the refill tips system can save 60% of laboratory space and 70% of plastic. Without touching the tips, you can refill the shelf with one hand. Refill Pipette Tips can be used with universal carrier boxes.
Pipette Tip Refill System,Pipette Tip Refills,Refilling Pipette Tips,Pipette Tip Refill,Pipet Tip Refill system
Yong Yue Medical Technology(Kunshan) Co.,Ltd , https://www.yonyuepcrtube.com