(1) Bevel form All joints are pipe-to-tube horizontal fixed butt joints (5G) with a bevel angle of 6O.
(2) Selection of welding consumables Considering the requirements of tensile strength, impact toughness, and oil field corrosion resistance (mainly sulfur-proof) of 30CrMo quenched and tempered steels (not including Ni in welding seams and .1.0% of welding consumables), 4, 2.4mm HJ8CrMoA wire primer, West 3.2ram low hydrogen electrode J857Cr (AWSEl2015-G) fill the cover.
(3) Determination of preheating and lay-up temperatures According to the carbon equivalent formula recommended by the International Welding Society (IIW), 30CrMo carbon equivalents Ceq = 0.52% to 0.73% are calculated. According to the carbon equivalent formula recommended by the American Welding Society (AWS), 30CrMo carbon equivalent CE = 0.55% to 0.77% was calculated. It can be seen that 30CrMo steel has poor weldability and should be preheated before welding. According to the recommendations of ASMEIX Volume: The minimum preheat temperature is 129~C, and the maximum temperature is 3l0 °C. The actual preheating temperature is 20WC, and the layer temperature is 180~240~C.
(4) Post-weld heat treatment In order to prevent the occurrence of cold cracks, improve the impact toughness of the joints, and reduce joint hardness, especially the highest hardness of the heat-affected zone (HAZ), post-weld heat treatment should be performed immediately after welding. Heat to 600 °C, heat 2h, heating and cooling rate does not exceed 150 ~ C / h. If it is not possible to perform post-weld heat treatment in time, it is necessary to perform the same fire treatment for 400 hours of heat preservation on the welded joint.
(2) Selection of welding consumables Considering the requirements of tensile strength, impact toughness, and oil field corrosion resistance (mainly sulfur-proof) of 30CrMo quenched and tempered steels (not including Ni in welding seams and .1.0% of welding consumables), 4, 2.4mm HJ8CrMoA wire primer, West 3.2ram low hydrogen electrode J857Cr (AWSEl2015-G) fill the cover.
(3) Determination of preheating and lay-up temperatures According to the carbon equivalent formula recommended by the International Welding Society (IIW), 30CrMo carbon equivalents Ceq = 0.52% to 0.73% are calculated. According to the carbon equivalent formula recommended by the American Welding Society (AWS), 30CrMo carbon equivalent CE = 0.55% to 0.77% was calculated. It can be seen that 30CrMo steel has poor weldability and should be preheated before welding. According to the recommendations of ASMEIX Volume: The minimum preheat temperature is 129~C, and the maximum temperature is 3l0 °C. The actual preheating temperature is 20WC, and the layer temperature is 180~240~C.
(4) Post-weld heat treatment In order to prevent the occurrence of cold cracks, improve the impact toughness of the joints, and reduce joint hardness, especially the highest hardness of the heat-affected zone (HAZ), post-weld heat treatment should be performed immediately after welding. Heat to 600 °C, heat 2h, heating and cooling rate does not exceed 150 ~ C / h. If it is not possible to perform post-weld heat treatment in time, it is necessary to perform the same fire treatment for 400 hours of heat preservation on the welded joint.
"Wuxi Holly" rubber handle protector is produced with high-quality performance material NBR/Silicon. The material is soft and elastic. Especially suitable for sports equipment, fitness equipment, skipping rope, baby carriage, garden tools, luggage handles, and can also be used as furniture, stationery, electronic parts for shockproof, filling and sealing purposes. The company can also provide professional design for customers, The production of high, precise, and other special products required.
Rubber Foam Grip Handle,Handle Grip Handle,Rubber Foam Handle Sleeve,Rubber Handle Cover
Wuxi Holly International Trading Co., Ltd , https://www.hollynbrs.com