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堆焊耐磨板埋弧焊的焊前准备事项有哪些?

所属分类:公司动态 发布时间:2021-04-26 来源:https://www.lcnaimoban.com/ 浏览量:

埋弧焊在焊接前必须做好准备工作,包括堆焊耐磨板的坡口加工、待焊部位的表面清理、焊件的装配以及焊丝表面的清理、焊剂的烘干等。
Preparation work must be done before submerged arc welding, including groove processing of hardfacing wear-resistant plate, surface cleaning of parts to be welded, assembly of weldment, cleaning of welding wire surface, drying of flux, etc.
①坡口加工
① Groove processing
坡口加工要求按GB 986—1988执行,以保证堆焊耐磨板焊缝根部不出现未焊透或夹渣,并减少填充金属量。坡口的加工可使用刨边机、机械化或半机械化气割机、碳弧气刨等。
Groove processing shall be carried out according to GB 986-1988, so as to ensure that there is no incomplete penetration or slag inclusion at the weld root of hardfacing wear-resistant plate and reduce the amount of filler metal. Groove processing can use edge planer, mechanized or semi mechanized gas cutting machine, carbon arc air gouging, etc.
②待焊部位的清理
② Cleaning of parts to be welded
焊件清理主要是去除锈蚀、油污及水分,防止堆焊耐磨板气孔的产生。一般用喷砂、喷丸方法或手工清除,必要时用火焰烘烤待焊部位。在焊前应将坡口及坡口两侧各20mm区域内及待焊部位的表面铁锈、氧化皮、油污等清理干净。
Weldment cleaning is mainly to remove rust, oil and moisture, to prevent the generation of pores in hardfacing wear-resistant plate. Generally, sandblasting, shot peening or manual cleaning are used. When necessary, the parts to be welded are baked with flame. Before welding, the rust, oxide scale and oil stain on the surface of the groove and thearea of 20 mm on both sides of the groove and the parts to be welded shall be cleaned.
NM450耐磨板
③焊件的装配
③ Assembly of weldment
装配堆焊耐磨板时要保证间隙均匀,高低平整,错边量小,定位焊缝长度一般大于30mm,并且定位焊缝质量与主焊缝质量要求一致。必要时采用专用工装、卡具。对直缝焊件的装配,在焊缝两端要加装引弧板和引出板,堆焊耐磨板待焊后再割掉,其目的是使焊接接头的始端和末端获得正常尺寸的焊缝截面,而且还可除去引弧和收尾容易出现的缺陷。
When assembling the hardfacing wear-resistant plate, it is necessary to ensure that the gap is uniform, the height is flat, the misalignment is small, the length of the positioning weld is generally greater than 30mm, and the quality of the positioning weld is consistent with that of the main weld. Special tooling and fixtures shall be used when necessary. For the assembly of straight seam weldment, arc striking plate and lead out plate should be installed at both ends of the weld, and the hardfacing wear-resistant plate should be cut off after welding. The purpose is to make the beginning and end of the welded joint obtain the normal size of the weld section, and also to remove the defects prone to arc striking and ending.
④焊接材料的清理
④ Cleaning of welding materials
埋弧焊用的焊丝和焊剂对焊缝金属的成分、组织和性能影响极大。因此堆焊耐磨板焊接前必须清除焊丝表面的氧化皮、铁锈及油污等。焊剂保存时要注意防潮,使用前必须按规定的温度烘干待用。
The welding wire and flux used in submerged arc welding have great influence on the composition, microstructure and properties of weld metal. Therefore, the oxide scale, rust and oil on the welding wire surface must be removed before welding. When the flux is stored, attention should be paid to moisture-proof, and it must be dried according to the specified temperature before use.
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The above content is provided by nm500 wear-resistant plate, more wonderful please click: https://www.lcnaimoban.com We adhere to the integrity-based business philosophy, welcome your cooperation!
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