best way to weld sheet metal

{"title":"Bi - Metal M3\/M42 High Speed Steel Hole Saw For Metal Sheet Red Color","imgUrl":"https:\/\/img.chinax.com\/nimg\/da\/2d\/b94d6416502454749b2098280eeb-200x200-1.jpg","attrs":{"Price":"Negotiation","Brand Name":"RTCRAFT or OEM","Model Number":"14-210mm","Minimum Order Quantity":"Negotiation","Delivery Time":"about 20days after your deposite","Certification":"ISO,MPA,TUV","Place of Origin":"CHINA","Payment Terms":"L\/C, T\/T, Western Union","Supply Ability":"100000pcs\/month","Packaging Details":"Paper box,Blister Card,Plastic box","Product Name:":"Bi-Metal Hole Saw","Tooth:":"4\/6 tooth","Color:":"Red,White,Yellow,according to your requirements","Depth:":"38mm and 47mm","Package:":"Paper box,Plastic box,Blister Card","Material:":"HSS M3\/M42"}}

{"title":"10mm Welded Steel Embed Plates In Embedded Concrete Concrete Steel Plate","imgUrl":"https:\/\/img.chinax.com\/nimg\/af\/c0\/47ff21fde2fc0f6b99a83bac7e58-200x200-1.jpg","attrs":{"Price":"According to customer product pricing Negotiable","Brand Name":"Billion Steel","Model Number":"OEM customization","Minimum Order Quantity":"1 item","Delivery Time":"3-15 working days according to the number of orders placed by customers","Certification":"IS9001\uff1a2015 \/ TUV \/ RoHS","Place of Origin":"Guangdong, China (Guangzhou, Guangdong)","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram","Supply Ability":"Supply 100,000 pieces per month","Packaging Details":"Standard sea packing or as customer's request","length":"500mm","width":"330mm","thickness":"10mm","Material":"mild steel \/ rebar \/ round steel","craft":"Cutting \/ Punching \/ Welding","Serve":"OEM customization","size":"OEM custom parts","product name":"Embedded Parts Service In Concrete On Construction Sites"}}