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1、Basic Principles of Steel StructuresMethods and Forms of Welded Connections6.1.1 Commonly Used Welding Methods6.1.2 Types of Welded Connections6.1.1 Commonly Used Welding Methods（1）Principle of welding process Welding mechineWelding cableMolten poolElectrodeElectrode holderShielding gasWeldmentElect
2、ric-arcFig.6.1 Manual shielded metal-arc welding.Manual shielded metal-arc welding(SMAW)1.1.6.1.1 Commonly Used Welding MethodsE43 electrode for steel Q235.1 1E50 electrode for steel Q345.2 2E55 electrode for steel Q390.3 3E60 electrode for steel Q420.4 4Fig.6.2 Electrode and welding photo.（2）Electr
3、ode typesManual shielded metal-arc welding1.1.6.1.1 Commonly Used Welding MethodsFig.6.3 Submerged arc welding.、Wire reelWire feederFeed tube for granular fluxWelding fluxMelten weld metalBase metalSubmerged arc welding(SAW)2.2.6.1.2 Types of Welded ConnectionsButt welds（1）Degree of fusion1.1.Fig.6.
4、4 Full penetration butt weld.Full penetration butt welds.1 16.1.2 Types of Welded ConnectionsButt welds（1）Depth of penetration1.1.Fig.6.5 Partial penetration butt welds.Partial penetration butt welds.2 26.1.2 Types of Welded ConnectionsButt welds（2）Angle between butt weld and force1.1.(a)Straight bu
5、tt weld(b)Oblique butt weld(c)T-butt weldStraight butt weld.1 1Oblique butt weld.2 2T-butt weld.3 3Fig.6.6 Relationship between butt weld and force.6.1.2 Types of Welded ConnectionsFillet welds（1）Section shapes of fillet welds2.2.Right angle fillet weld.1 1Fig.6.7 Right angle fillet weld.6.1.2 Types
6、 of Welded ConnectionsFillet welds2.2.Bevel angle fillet weld.2 2Fig.6.8 Bevel angle fillet weld.（1）Section shapes of fillet welds6.1.2 Types of Welded ConnectionsFillet welds2.2.Fig.6.9 Relationship between fillet weld and force.Oblique fillet weld.1 1Longitudinal fillet weld.2 2Transverse fillet weld.3 3（2）Angle between fillet weld and force