No proceso de fabricación da torre de enerxía eólica, a soldadura é un proceso moi importante. The quality of welding directly affects the production quality of the tower. Therefore, it is necessary to understand the causes of weld defects and various prevention measures.
(1) The main reasons for air holes: there are rust, oil stain, etc. on the surface of base metal or filler metal, and the amount of air holes will increase if the welding rod and flux are not dried, because the rust, oil stain, and the moisture in the coating and flux of the welding rod decompose into gas at high temperature, increasing the content of gas in the high-temperature metal. A enerxía da liña de soldadura é demasiado pequena e a velocidade de refrixeración da piscina fundida é grande, o que non é propicio para a fuga do gas. A desoxidación insuficiente do metal de soldadura tamén aumentará a porosidade do osíxeno.
Medidas de prevención:
A. Remove the oil stain, rust, water and sundries from the welding wire, working groove and its adjacent surfaces.
c. DC reverse connection and short arc welding shall be adopted.
E. soldadura realizarase con especificacións relativamente fortes.
Medidas para evitar fisuras de cristal:
A. Reduce the content of harmful elements such as sulfur and phosphorus, and weld with materials with low carbon content.
b. Certain alloy elements are added to reduce columnar crystals and segregation. For example, aluminum and iron can refine grains.
c. The weld with shallow penetration shall be used to improve the heat dissipation condition so that the low melting point material floats on the weld surface and does not exist in the weld.
d. As especificacións de soldadura serán razoablemente seleccionadas, e adoptaranse o precalentamento e o calefacción posterior para reducir a taxa de refrixeración.
e. Adopt reasonable assembly sequence to reduce welding stress.
A. Pay attention to the strengthening effect of metallurgical elements and their influence on reheat cracks.
b. Razoablemente pre -quentar ou usar o despois para controlar a taxa de refrixeración.
c. Reduce residual stress to avoid stress concentration.
d. Durante o temperamento, evite a zona de temperatura sensible das fisuras de recalentamento ou acurta o tempo de residencia nesta zona de temperatura.
Medidas para evitar fisuras frías:
A. Low hydrogen type alkaline welding rod shall be used, dried strictly, stored at 100-150 ℃, and used when taking.
c. Select reasonable welding sequence to reduce welding deformation and welding stress.
d. Realizar o tratamento térmico de eliminación de hidróxeno no tempo despois da soldadura
Tempo de publicación: novembro-08-2022