Welding stress is an important factor causing various welding cracks in welded joints, and the residual stress in welded parts will affect the service life of structures. Therefore, in order to improve the welding quality of the whole component, measures must be taken to control and reduce the welding residual stress. In order to reduce…
1. Clean up the slag Carefully clean the slag at the Angle between the bottom weld and the base material on both sides of the groove, and the slag at the superposition of welding spot and welding spot. 2. Shipping method At the position 5-6 o ‘clock of the clock, that is, after the arc…
Argon arc welding and argon arc welding bottom in the process of no difference, argon arc welding is suitable for thin-wall small pipe diameter (generally DN60 and below, wall thickness of 4mm) below, to ensure the quality of the weld root appearance formed. When the pipe diameter is large and the wall thickness is thick,…
Different quality grades shall be selected according to the importance of the structure, load characteristics, weld form, working environment and stress state, etc., according to the following principles: 1. In the components requiring fatigue calculation, all butt welds should be fully welded, and their quality grade is: 1) For transverse butt welds or t-shaped butt…
I. Guarantee project 1. Welding materials shall meet the design requirements and relevant standards, and quality certificates and baking records shall be checked. 2, the welder must pass the examination, check the welder corresponding welding conditions of the certificate and the date of assessment. 3. Grade ⅰ and ⅱ welds shall be inspected by flaw…
A joint with an Angle between the surfaces of two welds greater than or equal to 135° and less than or equal to 180° is called (A). A. butt joint B. t-joint C. lap joint D. Angle joint (302) Electric shock accidents can be divided into direct shock and (B). A. Indirect shock B. indirect…
LNG ship: also called LNG ship, referred to as “LNG ship”. It refers to a “ship” that specializes in transporting LIQUEFIED natural gas. The earliest LNG carrier was the 5,100-square-meter Methane Lightor, which was converted from an old tanker in 1958. According to the structure of liquid cargo tank can be divided into independent storage…
Argon arc welding handle, mop, internal wire filling, external wire filling, arc starting, welding, arc closing Argon arc welding operation: argon arc is a kind of left and right hand operation at the same time, which is the same as the left hand drawing circle and the right hand drawing square in our daily life.…
Instructor: Mr. Bai Jinsheng, Deputy director/chief expert of Special Welding Service Center of China National Defense Technology and Industry, distinguished professor/professional leader of Tianjin Sino-German University of Applied Technology. 1. Question raising Energy Institute of Tianjin Sino-German University of Applied Technology developed China’s special weapons and equipment, and encountered mechanical connection between graphite electrode and…
Hot air welding is also called hot air welding. Compressed air or inert gas (usually nitrogen) is heated to the desired temperature by a heater in a welding torch and sprayed onto the plastic surface and welding strip so that the two are fused and combined under moderate pressure. Oxygen sensitive plastics (such as polyphthalamide)…
