【正文】 最重要的。感謝張立峰老師的悉心指導(dǎo)，另外，向在工作之余還要抽出時(shí)間對(duì)我的論文進(jìn)行評(píng)閱及考核并提出寶貴意見的各位老師致以最衷心的感謝！第一次去設(shè)計(jì)一本完整的焊接工藝，包括應(yīng)選用的焊接工藝評(píng)定、電流、電壓、焊接速度以及焊接結(jié)構(gòu)的設(shè)計(jì)，焊接材料和焊接方法的選擇，焊工應(yīng)持證項(xiàng)目等，任務(wù)艱巨。s great affinity for oxygen and iron powder are doxycycline titanium rod can be protected in beneficial elements and silicon manganese oxide from into molten pool, cooling after welding quality.Bonding is pressurized conditions, make two workpiece in solid between atoms, realize the bination and solid welding. The pressure welding is used, when the current through the butt weld resistance when the two parts connected by resistance, and rising temperatures, the great when heated to plastic state, in the axial pressure connection bee one.Various pressure welding method is mon in welding process without pressure and filling materials. Most pressure welding methods such as diffusion welding and welding, cold welding are no melting process, thus not so good as welded alloy elements, and the harmful elements into burning weld question, thus simplifying the welding process, welding and improve the safety and hygiene conditions. At the same time as heating temperature, heating time is short of low penetration, heat affected zone. Many difficult welding materials with melting, often can use bonding welded with the base amount of quality connectors.Brazing is the low melting point of use than workpiece materials metal brazing alloy, the workpiece and metallurgical heated to higher brazing alloy melting temperature of melting, workpiece, using the liquid filling analyzed wet parts, and with workpiece interface between atomic interdiffusions of realization, thus realize welding method.Welding the formation of connecting the two are connected the weld seams called. When the welding seam by both in welding heat, and organization and performance variation, a region called the heat affected zone. When the welding workpiece materials for welding materials, welding current and welding in different welding and heat affected zone may cause overheating, improver, hardening or softening phenomenon, also make the welding performance deterioration, and weldability. It will need to adjust welding conditions, a former butt weld at preheating, welding and welding heat preservation can improve the welding quality of welding.In addition, welding is a local rapid heating and cooling process, welding workpiece due to the area around the body cannot free at expansion and contraction, after cooling occurs in the welding of welding stress and deformation. Important after welding products are necessary to eliminate the welding stress, deformation correction.Modern welding technology has a defect of internal and external welding is equal to or above, mechanical properties of welding is connected. In the space by welding welding joints, each place called the strength in doublequick weld quality, but also its geometric shapes, sizes, stress and working conditions. The basic form of joint have docking, lap, tshaped meet (are) and Angle handover etc.Butt weld joints of crosssectional shape, decided to be in before welding welding and thickness of the two forms of groove. Thicker steel welded to weld fully in the place of the open mouth, so slope shape more easily into the electrode wire or. Groove is onesided welding process of form of groove and welding process of both sides. Choose groove, except that the weld fully should also be considered welding process is convenient, the filler metal welding deformation quantity is little, small mouth and low processing cost.The two different thickness steel butt, to avoid to cause serious change sharply section stress concentration, the thick plate cutting edge gradually, to connect the two etc. The static strength and fatigue strength than other joints. In the alternative, shock, or in low pressure vessel in the work, often give priority to the docking joints welded.Lap joints of welding preparation work is simple, convenient, assembly welding deformation and residual stress on site installation, so smaller joints and not important structure often USES. Generally speaking, lap joints is not suitable for alternating load in corrosive medium, such as high and low temperatures under the working conditions.Using a tee and Angle joint structure is usually due to the need. Tee on the welding seam characteristics and the Angle of lap joint Angle of weld similar. When the vertical direction with external welding bee positive fillet weld seam, different surface shape can cause stress concentration, Welding the weld stress condition and joint Angle joint similar.Angle joint bearing capacity is low, generally not used alone, only in welding, or in the internal and external has improved fillet weld when used in closed form the corner of the structure.Welding products than riveting, castings and forgings for weight, it can reduce the transportation and energy savings. Good sealing, suitable for welding of manufacturing all kinds of containers. Joint development process, make welding and forging, casting, bining can be made into large economic and rational ZhuHan structure and forge welding structure, and the economic benefit is high. Using welding materials, effectively using juniorsenior welding structure can adopt different in different parts of the properties of materials, full of various materials, high quality, achieve economic specialty. Welding has bee an indispensable modern industry, but also an