Poor welding preheating before welding, should be.
焊接性差，焊前应预热。
The analysis of the corrosion form and environment confirms that the main cause of the corrosion is the poor welding quality and water permeation.
通过对腐蚀形貌和环境进行分析，确认罐顶焊接质量差和雨水渗入是造成腐蚀的主要原因。
Comprehensive analysis shows that the welding rod material has poor welding performance, if the cooling rate after welding is too rapid, then the welding stress can be too large.
综合分析表明，拉杆材料焊接性能差，焊后冷却速度过快，以致焊接应力过大。
Material for rail of crane is of strong strength because of high carbon content, but of poor weldability, which makes more cracks. Strict technique is required in such welding.
吊车轨道的材料由于其含碳量较高，强度大，可焊性较差，焊接时容易产生裂纹， 因此要严格按照工艺执行。
Stick Welding Porosity in a weld is considered poor quality.
棒焊接的焊缝气孔被认为是质量差。
The bypass mechanism of valve proper for the heavy duty gas turbine has a large dimension and large welding quantity with poor structure rigidity.
重型燃机旁路机构阀体主体尺寸大、结构刚性差、焊接量大。
Such problems in accessary welding as insufficient weld depth and length, and poor visual quality will cause future safety problems.
一些附件焊高不够、焊缝长度不足及焊缝外观质量差等施工安装问题，都会对安全生产留有后患。
Longtan hydropower station is large in big structure size of spiral case, high in installation accuracy and welding requirement, poor in welding environment, and short in construction period.
龙滩水电站机组蜗壳结构尺寸大，安装精度和焊接要求高，焊接环境差，工期要求短。
If the protective seal is not air proof or poor gas purity, it will also bring welding quality problems.
气路有密封不好的问题，或气体纯度不高，也会引起焊接质量问题。
Because TIG welded joints without filler wire always hold low strength and poor formation, tungsten inert gas welding process with filler wire is inevitable.
由于镁合金不填丝的TIG焊接接头强度低，焊缝表面成型不好，所以，镁合金的填丝tig焊接方法不可避免。
In view of the welding image feature of strong noise and poor stability, a fuzzy detection algorithm of welding image based on wavelet and morphology denoising was presented.
针对焊接图像噪声大、稳定性差的特点，提出了一种基于小波降噪和形态学模糊检测的算法。
Annual overhaul, the impeller blades have cavitation pitting damage, each must overhaul welding and grinding blades, but also labor-intensive maintenance personnel and poor working environment.
每年大修时，叶轮叶片有汽蚀破坏麻点，每次大修都要焊补和打磨叶片，而且维护人员劳动强度大、工作环境差。
Poor sub-sea welding is avoided by using bolt connection; it can be directly used for sub-sea pipeline welding.
由于采用螺栓联接，避免了焊接质量差的水下焊接，可直接用于海底管道维修。
Manual welding, manual welding, neat poor, easy to produce porosity slag.
手工组焊，手工作业，焊接工整性欠佳，易产生气孔夹渣。
The spot welding performance of aluminum alloy is poor because of its high thermal conductivity and low resistivity characteristics.
由于铝合金高导热率和低电阻率的特点，因此其点焊性能较差。
The utility model can reduce the strength and speed of a descending welding head to a frame surface, and the utility model efficiently overcomes chip incline caused by poor back flowing of lead tin.
本实用新型可减缓焊头下降到达框架表面的力量和速度，有效地克服由于铅锡回流不良而引起的芯片倾斜。
The utility model can reduce the strength and speed of a descending welding head to a frame surface, and the utility model efficiently overcomes chip incline caused by poor back flowing of lead tin.
本实用新型可减缓焊头下降到达框架表面的力量和速度，有效地克服由于铅锡回流不良而引起的芯片倾斜。
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